1a*
Strain is
force (a part of one’s body or oneself) to make an unusually great effort.
2 )
i ) quantity of charge
ii) nature of element
iii ) Time
2biThe boiling point of a liquid Is the point at which The vapour pressure is equal To atmospheric pressure
3)
-Diamagnetic material
-Paramagnetic material
-Ferromagnetic material
4a)An intrinsic semiconductor, also called an undoped semiconductoror i-type semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities.


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 4b)
i)Rockets are used for space travel
ii)military uses, 
iii)launching satellites into space

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*5)*
Range = u²Sin2tita/g
At maximum range 
Sin2tita = 1
2tita =sin^-1(1)
2tita = 90dgrees 
Tita = 90/2 = 45degree

 Maximum height reached = u²sin²tita/2g
=u²(sin45)²/2g
=200²(sin45)²/2(10)
=40000(1/√2)2/20
=40000(1/2)/20
=20000/20
=1000metres.

 6)
Given constant = 2.9×10^-3mk
Temperature = 57degreeC = (57+273)k = 330k
Using landamaxT = constant
landamaxT330 = 2.9×10^-3
landamax = 2.9×10^-3/330
landamax = 8.788×10^-6m
The speed of electromagnetic wave, v = 3×10^8m/s
Using V = f landa
f = v/landa
=3×10^8/8.788×10^-6
=3.4×10^13Hz

7(a). LASER stands for Light Amplification by Stimulated Emission of Radiation.
(b). A laser is a device that emits a beam of coherent light through an optical amplification process.

9a(i) 
i. Nature of the Substance 
ii.Medium of transmission 

 9a(ii)
i.State or phase of the substance (i.e Solid, Liquid or gas). 
ii.Temperature of the medium 

 9b) 
i. Temperature 
ii. Specific hear capicity kf the Body

 9c) 
The statement means that the amount of hear energy required to change 1kg of liquid mercury to gaseous mercury without chang3 in temperature is 2.72*10^5Kg^-1

 9d(i)
PleasenNote (Ο€) means Change in temperature Q

 Q=MCΟ€Q

 V^2/R * t=MCΟ€Q

 (220)^2*4*60/35=M*4200*(100-28)

 33,885.7=302400m

 M=33,885.7/302400

 M=1.098kg

 9d(ii) 
V^2/R *t=MLv

 (220)^2 *5 *60/35=0.3*Lv

 414857.14=0.3Lv

 Lv=414857.14/0.3

 Lv=1382857.13Jkg^-1

*10a*
the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced.
10b
Critical angle: This is the angle of incidence in the denser medium when the angle of refraction in the less dense medium is 90°
*10bi*
the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
12a)
binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts. These component parts are neutrons and protons, which are collectively called nucleons

12b)* They have short wire length and high frequency.
-They are highly penetrating
-They travel in straight line
-They don’t require material medium for their propagation

(12a) This is defined as the amount of energy that must be supplied to a nucleus to completely separate it's nuclear particles (nucleons)

 (12b) 
(i) They have short wavelength and high frequency. 
(ii) They are highly penetrating. 
(iii) They travel in straight lines. 
(iv) They don't require material medium for their propagation.

 (12c) 
-It is used in production of electricity. 
-It is used to study and detect charges in genetic engineering. 
-It is used in agriculture. 
-It is used in treatment of cancer. 

 (12di)
E = hf-hfo
but f = v/landa
E= v/landa.h - wo
Where wo = hfo = work function 
f= frequency 
landa = wavelength 
Hence 
hf = hfo - E
f = hfo - E/h
f = wo - E/h
Recall; that v = f landa
Therefore f = v/landa = 3×10^8/4.5×10-7
=3/4.5 × 10^8+7
=6.6×10^14Hz
f = 6.6×10^14Hz

 (12dii) 
E = hf
=6.6×10^-34 × 6.6×10^14Hz
=43.56×10^-20J

 (12diii) 
Energy of the photoelectron E = hf - vo
=Energy of incident electron - work function 
=4.356×10^-19J - 3.0×10^-19J

=1.356×10^-19J










*SNT*
NIGERIA PH