EDUCATION

Education is the process of facilitating learning, or the acquisition of knowledge, skills, values, beliefs, and habits. Educational methods include storytelling, discussion, teaching, training, and directed research.

Knowledge

facts, information, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject.

Awareness

knowledge or perception of a situation or fact.

Mindset

In a fixed mindset, people believe their basic qualities, like their intelligence or talent, are simply fixed traits. They spend their time documenting their intelligence or talent instead of developing them. They also believe that talent alone creates success—without effort.

Clever

quick to understand, learn, and devise or apply ideas; intelligent.

Thursday, May 25, 2017

HISTORY OF NYAKYUSA PEOPLE FROM TANZANIA

The debate between Mahmood Mamdani and Basil Davidson in the Monthly Review of July-August 1993, which was sparked by Davidson's new book on Africa, The Black Man's Burden, requires an important correction. Both scholars present illuminating comments. My concern, however, is about one aspect only: the rectification of Nyakyusa history, of which both men seem to have insufficient understanding.
Davidson claims in his book that the Nyakyusa, who live in southwest Tanzania, as a tribe, were "invented" by European colonialism. He states: At first, the British set themselves to the work of inventing tribes for Africans to belong to; later, with possible independence looming ahead, they turned to building nation-states.(1)
Among such formed "new tribes," he goes on, were: the Sukuma and the Nyakusa [sic], [who] rose fully formed from the mysterious workings of "tradition." Not being worried by such workings, whatever Europeans supposed them to be, such coagulated clans and segments do not seem to have minded becoming "tribes"with exotic names. .but rather pleased about it.(2)
While I cannot speak for the Sukuma because of my unfamiliarity with their history, the origins of the Nyakyusa do not jibe with Davidson's historiography at all. His mistake is based on John Iliffe's book, A Modern History of Tanganyika, which, on the subject of the creation of African tribes, Davidson lauds as "exemplary" and "excellent."(3) But what does Professor Iliffe say that Davidson finds so
Walusako Mwalilino is a journalist and former Associate Officer in the Department of Political and General Assembly Affairs at the United Nations. He is a contributor to The Oxford Companion to Politics of the World (New York: Oxford University Press, 1993). enlightening? The following passage represents the core of Iliffe's thesis:
The most spectacular new tribe were the Nyakyusa. In the nineteenth century their name described only inhabitants of certain lakeshore chiefdoms. Some German observers and early British officials extended it to embrace also the Kukwe and Selya further north, their culture being broadly similar. After failing to impose paramounts on this essentially stateless people, the British established a council of chiefs in 1933 and described it as the tribal system. Buttressed by distinctive culture, common language, and sheer isolation, the newly-invented Nyakyusa tribe soon became an effective political unit.(4)
In my opinion, this type of revisionist history is less than "exemplary" or "excellent." To start with, it's not true that in the nineteenth century the name Nyakyusa "described only inhabitants of certain lakeshore chiefdoms;" that they were a "stateless people;" or that they were an "invented" tribe. Let's consider the facts.
The heartland of the Nyakyusa is bordered by the Rungwe mountain in the north, the Songwe river in the south, and Lake Malawi in the east. Residents below the mountain, forty miles away from the lakeshore, also called themselves Nyakyusa. The whole area is now part of Mbeya Region, but the people still call their country Unyakyusa. The Songwe river forms the Tanzania-Malawi boundary; a smaller number of Nyakyusa live on its south bank, inside Malawi. The Nyakyusa are closely related to the Ngonde, of north Malawi, who occupy the river's south bank and stretching forty-two miles south on the lake's plain. The two groups speak the same language (with a minor difference in accents), although the Nyakyusa refer to their version as Kinyakyusa, while the Ngonde call theirs Kyangonde. And both groups pray to Kyala (God).(5) According to Malawian historian, Professor Owen Kalinga, the Nyakyusa settled in Rungwe valley between 1550 and 1650, a fact now supported by carbon dating.(6) The founders of the Ngonde nation settled in Malawi in 1600.(7)
Thus, centuries prior to the arrival of the British consul, Frederic Elton, in 1877, the first European to travel in Unyakyusa, the people had developed a political system of independent chiefdoms, without a central authority. …

The Hehe from East Africa


The Hehe Rebellion, conducted by the Hehe ethnic group of Tanzania, is one of the most famous anti-colonial rebellions in East Africa. 
The rebellion happened in 1891 during the reign of chief Mkwawa. Mkwawa had accumulated power through war and intimidation of his enemies. The Hehe territory expanded greatly northwards in early 1880’s through the Mkwawas brutal leadership. Tribes living along the caravan routes near central Tanganyika (now Tanzania) were attacked and displaced to pave way for the most powerful group, the Hehe. 
Mkwawa chiefdom grew to become the most feared chiefdom in the south eastern region in 1890 afflicting and silencing the Wakaguru and the Wagogo. The Hehe spared no one including the Germans and their supporting local tribes. It is then when serious conflicts between the Hehe and the Germans began.
The Wahehe (Swahili plural for Hehe) expanded northwards at a time when the Germans were busy building stations along the caravan route in the central region of Tanzania. There were local tribes who pledged loyalty to the Germans and could carry and show the German flags. These local tribes were a cheap bait for the Hehe. The German-loyal tribes were cruelly assaulted, plundered, and destroyed by the Hehe despite attempts by the German leadership to dialogue. 
On August 17, 1891 Julius von Soden, the then governor of German East Africa authorized an attack by the Germans to the Wahehe. The planned attack was to be headed by Zelewski the then German commander. What followed was to be an historical defeat of the Germans by the Wahehe as reported from a combination of records, A Modern History of Tanganyika by Ilife, Emil Zelewski by Holger Doebold and Lt. Tettenborn’s official report. 
On that day at six thirty the Germany commander Zelewski led troops to the inland area. It is reported that three local worriors were killed and about twenty five large houses torched. Wahehe worriors in readiness for response were armed with only spears and weapons and could easily be frightened with a few shots by the Germany troops. When a Germany officer drew attention by shooting a bird the local worriors began attacking the opponents. Though the locals had only a few riffles they easily overcame the Germany side. The Askaris were already overpowered after making only two shots. In ten minutes very significant events occurred; the pack donkeys retreated stampeding on 5th company, the Askaris could not bear any more and so they had to retreat. Three officers of the Germany camp pushed until they reached a nearby tembe where the body of Zelewski the commander was found on his donkey. Zelewski had been speared by a sixteen year old.

Most of the column died and the rearguards took to the hill, raised the flag and began the process of rallying those who had survived. NCO Thieman died on the night of 17th to 18th August and was buried near the Wahehe. Lt. Heydebreck escaped with spear wounds behind his right ear. The Hehe persistently pursued the Germany troops, setting fire on grass to kill the wounded and pushing to encircle the rearguard. However, the Hehe group of 300-400 did not attack the Germany army.
The Hehe also had their share of spoils; 60 warriors died that day and 200 later died of wounds.
The rebellion saw a significant number of Hehe chiefs dead with Mkwawa wrongly included in Lt. Tettenborn report. As opposed to the reports the claimed “main part of the baggage” was not saved. The German loss was huge; ten out of thirteen Europeans died, 256 out of the dispatched 320 Askaris perished, 96 out of the total 170 porters were lost. This earned the Wahehe a fame that no other group had in the region, they were termed as the most powerful soldiers of the moment. Despite an unhappy Germany military the sitting governor banned any form of expedition or revenge upon the Wahehe by the Germans. The directive however, was not obeyed by some angered military persons like von Pronce who could still attack the Wahehe from the north.
Governor Soden after leaving Tanzania to his home country in 1893 was succeeded by Freiherr von Schele. With the governorship changes expeditions were restarted by the Germany Military headed by Zugführer Bauer and two other militants; Zugführer and Wynecken. In 1894, after negotiations had failed and caravans continued to be attacked the Germans succeeded in capturing the then capital city of Mkwawa, Iringa. The seizing of Iringa did however not lead to peace since the still free Mkwawa led his people to attack the neighboring tribes and the Germans.
Divisions arose among the Wahehe in 1896; some expressed submission to the Germans and Mkwawa was isolated as a criminal. The Mkwawa loyals protected him and helped him in his attacks over the Germans. Many Wahehe were killed by the Germans for aiding Mkwawa. Mkwawa’s brother was executed after two months of service as Mkwawas successor.
After an intensive such by the Germans, eventually Mkwawa was captured in July 1898. After being trapped by the Germans Mkwawa shot himself, his head was chopped off and send to German. Mkwawas skull was later to be returned to Tanzania after insertion of the Treaty of Versailles ordering so. Though the identity of the skull was questionable it was returned in 1956 to Kalenga and not Iringa.
Today Mkwawa remains a renown national hero in the history of the country of Tanzania
Since then the people of Hehe have never again made a revolution but still regarded as a strong, intelligent tribe.
The Hehe people have increased from about 250,000 in 1957 to an estimate of 805,000 people according to a census of 2006.
Sources:

Structure of Atom


Subatomic Particles:

Name
Electron
Proton
Neutron
Symbol
e-
p
n
Approximate relative mass
1/1836
1
1
Mass in kg
9.109×10–31
1.673×10–27
1.675×10–27
Mass in amu
5.485×10–4
1.007
1.008
Charge (coulomb)
1.602×10–19
1.602×10–19
0
Actual Charge (e.s.u)
4.8 × 10–10
4.8 × 10–10
0
Atomic Models:

Thomson’s Atomic Model (Plum – pudding model):-

Postulate: -Atom is a sphere of positive charge in which number of electrons are embedded.
Limitations: - Could not satisfactorily explain the results of scattering experiment carried out by Rutherford.

Rutherford’s Model:

Postulates:-
  • Almost all the positive charge and mass of atom is present in its nucleus.
  • Electrons revolve around the nucleus in circular orbits.
  • There is strong electrostatic attraction between nucleus and electrons
Limitations: - Could not explain stability and electronic structure of atom.

Atomic Terms

Terms
Definition / Explanation
Atomic Number (Z)
Number of protons or electrons of neutral atom.
Mass Number (A)
Total number of protons and neutrons in an atom
Nucleons
Protons and neutrons are present in a nucleus. So, these fundamental particles are collectively known as nucleons
Isotopes
Atoms of the element with same atomic number but different mass number e.g. 1H11H21H3.
Isobars
Atoms having the same mass number but different atomic numbers, e.g. 15P32 and 16S32
Isotones
Atoms having the same number of neutrons but different number of protons or mass number, e.g. 6C148O167N15
Isoelectronic
Atoms, molecules or ions having same number of electrons e.g. N2,CO, CN
Nuclear isomers
atoms with the same atomic number
and same mass number but with
different radioactive properties.
Example of nuclear isomers is
Uranium –X (half life 1.4 min) and
Uranium –Z (half life 6.7 hours
Isosters
Molecules having  same number of atoms and
also same number of electrons are called
isosters. E.g., N2  and CO
       
Wave 
 Crest and Trough of wave  
Terms
Explanation
Wave length (λ) 
Distance between two neighbouring troughs or crests.
Frequency (ν)
Number of times a wave passes through a given point in a medium in one second.
ν = c/λ
Velocity (c)
The distance travelled  by the wave in one second.
c = νλ
  
Wave number
Number of wavelengths per cm.

Amplitude (a)
Height of the crest or depth of the trough. Determines the intensity of the beam of light.
Electromagnetic Waves 
Radiations
Wave length (Å)
Radio waves
3×1014 to 3 ×107
Micro waves
3×109 to 3 ×106
Infrared (IR)
6×106 to 7600
Visible
7600 to 3800
Ultra violet (UV)
3800 to 150
X–rays
150 to 0.1
Gamma rays
0.1  to 0.01

Atomic spectrum of hydrogen atom:

  
Where, RH = Rydberg constant (108978 cm-1)
n1 and n2 have integral values as follows
n1
n2
Spectral Series
Spectral region
1
2,3,4…
Lyman
UV
2
3,4,5…
Balmer
Visible
3
4,5,6…
Pascher
IR
4
5,6,7…
Brackett
IR
5
6,7,8…
Pfund
IR
Photoelectric effect:
  • Ejection of electrons takes place from the surface of metal when light of suitable frequency fall on it.
  • Minimum frequency required for ejection of electron is called threshold frequency (vo).
  • Energy of the ejected electrons is directly proportional to the frequency of radiation.
  • Number of electrons ejected per second depends on the intensity of radiation. 
  •  hv- hvo =1/2mev2

Planck’s quantum theory:

Substances radiate or absorb energy discontinuously in the form of energy packets
The smallest packet of energy is called quantum. In case of light the quantum is known as photon.
The energy of a quantum is directly proportional to the frequency of the radiation.
E = hv were v is the frequency of radiation and  h is Planck’s constant having the value 6.626 × 10–27 erg sec or 6.626 × 10–34 J sec.
A body can radiate or absorb energy in whole number multiples of quantum hn, 2hν,3hν………..nhν, where n is the positive integer.

Bohr’s atomic model:

Electrons revolve around the nucleus in circular orbits of fixed energy.
Electron revolve only in those orbits whose angular momentum (mvr) is an integral multiple of h/2Π.
Electron absorbs energy in the form of EMR, when it jumps from lower energy level (ground state) to higher energy level (excited state) and vice-versa.
Energy absorbed or released in an electron jump, (dE) is given by dE = E2 – E1 = hν
Energy of stationary state oh hydrogen atom (En) =  -RH (1/n2)
For an hydrogen like species i.e. He+, Li2+ with atomic number Z
Radius of nth orbit (rn ) = 52.9 × n2/z  pm
Energy of nth orbit (En) = -2.18×10-18(Z2/n2= –13.6 ×(Z2/n2)  eV = 313.6 ×(Z2/n2) kcal /mole
Velocity of electron (v) = (2.18 ×108 ) z/n cms-1
Where n = 1,2,3,4…

Limitations of Bohr’s theory:

  • Failed to explain the spectra of atoms having more than one electron.
  • Failed to account for the splitting of spectral line source of a spectrum is placed in a strong magnetic or electric field.
  • Dual nature of particle and the uncertainty principle was ignored in the Bohr’s atomic model.

    de- Broglie equation:

     λ = h/mv = h/p

    Heisenberg’s uncertainty principle:      

    \Lambda x\times \Delta v\geqslant \frac{h}{4\pi m}
    It is impossible to determine simultaneously, the exact position and exact momentum of an electron.

    Quantum Numbers:

    Principal quantum number (n):

    • It tells the main shell in which the electron resides and the approximate distance of the electron from the nucleus.
    • Maximum number of electrons a shell can accommodate is 2n2.

    Azimuthal or angular momentum quantum number (l):

    • It represents the number of subshells present in the main shell.
    • These subsidiary orbits within a shell will be denoted as s,p,d,f…
    • This tells the shape of the subshells.
    • For a given value of n, there are n possible values of l starting from 0 to (n-1)
      Value of l
      0
      1
      2
      3
      4
      Notation of sub shell
      s
      p
      d
      f
      g

      The magnetic quantum number (m):

      • It determines the number of preferred orientations of the electron present in a subshell.
      • For a given value of l, there are (2l+1) possible values of m starting from –l to +l.
        Value of l
        0
        1
        2
        3
        Notation of sub shell
        s
        p
        d
        f
        Values of m
        0
        -1,0,1
        -2,-2,0,1,2
        -3,-2,-1,0,1,2,3

        The spin quantum number (s)

        • It determines the direction of spin of electron in an orbit.
        • There are only two possible values for spin quantum number i.e. -1/2 ,+1/2.

        Rules for filling of electrons in various orbitals :

        Aufbau Principle:

        • Electrons are added one by one to the various orbitals in order of their increasing energy starting with the orbital of lowest energy.
        • In neutral isolated atom, the lower the value of (n+ l) for an orbital, lower is its energy
        • The increasing order of energy of various orbital is : 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p <  6s < 4f < 5d ..
        Pauli’s Exclusion principle :- 
        An orbital can contain a maximum number of two electrons and these two electrons must be of opposite spin.
        Hund’s rule of maximum multiplicity :- 
        Electron pairing in p, d and f orbital cannot occur until each orbital of a given subshell contains one electron each or is singly occupied”.

        Exceptional Configurations

        Stability of half filled and completely filled orbitals
        Cu  has  29 electrons. Its expected electronic configuration is
        1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d9
        But a shift of one electron from lower energy  4s orbital to higher energy 3d orbital will make the distribution of electron symmetrical and hence will impart more stability.
        Thus the electronic configuration of Cu is
        1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10
        Fully filled and half filled orbitals are more stable