WAEC Physics 2011 Theory — Question 39
Question 39 of 39 from the West African Examinations Council (WAEC) Physics 2011 Theory paper, with the correct answer and a full explanation.
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15(d) If the source of the ultra-violet light in 15(c) above is moved away from the surface of the metal, state the effect on the maximum speed of the ejected electron.
Model answer
If the source of the ultra-violet light is moved away from the surface of the metal, the intensity of radiation reduces, and this will have no effect on the maximum speed of the ejected electron. The intensity of the incident radiation only affects the number of electrons emitted, not their maximum kinetic energy/speed.
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