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Physic Paper Question Paper

Physic Paper

Course:Secondary Level

Exam Year:2012

SPRAY HIGH SCHOOL
P.O. BOX 2565
COAST

END OF TERM TWO

DATE:9/7/2012

TIME:2 HRS 30 MIN

INSTRUCTIONS:
1.All questions are compulsory.
2.No use of phone in exam room.
3. Wrong numbering will lead to deduction of marks.

Q.1.The Y-plates in CRO creates an electric field to make the beam move up or down. What would be the direction of the magnetic field that would produce a similar? (2 marks)
Q.2.Determine the energy in electron volts gained by 2 electrons falling through a p.d. of 3.3 volts. (2 marks)
Q.3.State two factors that determine whether or not a radiation will cause photo electric effect on a certain surface.
(2 marks)
Q.4.Determine the energy of a photon of an X-rays wave of frequency 2800000000Hz
(5 marks)
Q.5.State how the kinetic energy photo electrons is affected by:
a)the intensity of incident radiation.
(2 marks)
b)the frequency of the incident radiation.
(2 marks)
c)the work function of the surface. (2 marks)
Q.6.Explain why ultraviolet light causes a negatively -charged electroscope to discharge,but not a positively-charged one.
(2 marks)
Q.7.Explain why it is necessary to earth the screen of a cathode ray oscilloscope.(2 marks)
Q.8.Determine the the minimum frequency required to cause photoelectric effect on a surface with a work function of 4.0 eV.
(2 marks)
Q.9.Name three radiations emitted by radioactive materials.
(3 marks)
Q.10.Draw a diagram to show how the different types of radio active emissions are affected by an electric field.On the same diagram show how each of the radiations can be stopped.
(2 marks)
Q.11.a)What is 'half-life' of a radiaoactive elenent. (2 marks)
b)What is nuclear fissin? (2 marks)
b)What do you understand by the term 'fusion' as applied in radioactive? (2 marks)
Q.12.State three uses of radioactivity.
(3 marks)

(2 marks)

Physic Paper Question Paper

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