K.C.S.E Physics Q & A - MODEL 2019PP2QN17
(a) Figure 10 shows a ray of light travelling from glass to air.
​Determine the:
(i) critical angle of the glass — air interface (ii) refractive index of glass (b) Apiece of metal is embedded at the centre of an ice block 15cm from the surface of the ice. Given that the refractive index of ice is 1.32, determine how far from the surface of the ice block the metal appears to be. (c) Figure 11 shows, two rays of incident on a diverging lens. 
Complete the ray diagram to show the path of the rays after passing through the lens.
(d) (i) State two differences between the human eye and a camera lens. (ii) State the name of the part of the eye that enable the lens to focus images of objects at different distances. ​
ANSWERS
​(d)(i) Eye has a variable focal length whole the focal length of camera lens is fixed
Image distance from the lens is almost constant in the eye while in a camera it can be varied Eye lens is muscle while glass/clear plastic (ii) Ciliary muscles
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K.C.S.E Physics Q & A - MODEL 2019PP2QN16
​(a) Define the following terms as used in waves:
(I) Amplitude (ii) Wavelength (b) Figure 8 shows water waves approaching a straight reflector at a speed of 40 cm/s. 
​(I) Draw on the diagram the reflected waves.
(ii) Given that the distance between the source and the reflector is 15 cm determine: I. the wavelength of the waves II. the frequency of the waves (c) Figure 9 Shows light rays from two coherent sources S1 and S2 falling on a screen. Dark and bright fringes are observed between A and B 
​(i) State how:
I. bright fringes are formed II. dark fringes are formed (ii) State what is observed when light of a higher frequency is used.
ANSWERS
(a)(i)Amplitude is the maximum displacement of a particle from the mean position
(ii)Wavelength is the distance between two successive points in a wave which are in phase OR Distance between two successive crests or troughs in a transverse Wave/between rarefaction or compressions in a longitudinal wave. 
(c)(I) due to constructive interference
(II) due to destructive interference (ii) The fringes get closer OR When the frequency is higher the wavelength reduces hence the fringe separation decreases K.C.S.E Physics Q & A - MODEL 2019PP2QN14
​Figure 6 shows radiation from the sun passing through glass in a greenhouse onto the floor. The floor then emits radiation
​State the name of the radiation emitted by the floor.
answer
K.C.S.E Physics Q & A - MODEL 2019PP2QN10
State how the intensity of X-rays in an X-ray tube can be increased.
answer
K.C.S.E Physics Q & A - MODEL 2019PP2QN08
State two uses of gamma rays in medicine.
answers
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