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K.C.S.E Physics Q & A - MODEL 2019PP2QN08
State two uses of gamma rays in medicine.
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 K.C.S.E Physics Q & A - MODEL 2018PP2QN11
​Arrange the following radiations in the order of increasing wavelengths;
Purple light, Gamma rays, infrared and ultraviolet
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K.C.S.E Physics Q & A - MODEL 2017PP2QN01
.State any two uses of microwaves.
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K.C.S.E Physics Q & A - MODEL 2011PP2QN12
​Table I shows radiations and their respective frequencies.
​Arrange the radiations in the order of increasing energy.
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Explain how an “excited‟ hydrogen atom is able to emit radiations of different wavelengths.13/7/2020
K.C.S.E Physics Q & A - MODEL 2005PP1QN31
Explain how an “excited" hydrogen atom is able to emit radiations of different wavelengths.
ANSWERS
K.C.S.E Physics Q & A - MODEL 2003PP1QN31
​ Arrange the following gin order of increasing frequency:
Visible light, infrared radiation, X – rays, u. v. radiation, radio waves.
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K.C.S.E Physics Q & A - MODEL 2002PP1QN16
The chart below shows an arrangement of different parts of the electromagnetic spectrum
​Name the radiation represented by A.
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K.C.S.E Physics Q & A - MODEL 2001PP2QN02
​ a) Fig 1 (a) shows the circuit of a simple telephone receiver. When the telephone is lifted, a steady current flows through the solenoids. When a person speaks into the microphone on the other side, a varying current flows. These two currents are shown in fig. 1(b).
​i) State the reason why solenoids are wounds in opposite directions around the soft-iron core pieces as shown.
ii) Explain how the speech current from the microphone is converted into sound in the receiver. iii) State and explain the effect of replacing the soft iron core pieces with steel core pieces. ​b) A step down transformer has 400 turns in the primary coil and 20 turns in the secondary coil A 50 ohms resister is connected to the secondary output. If the r.m.s (root-mean-square) value of the primary voltage is 240; determine the peak value of the current in the in the secondary circuit.
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K.C.S.E Physics Q & A - MODEL 2000PP1QN29
State two uses of microwaves.
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