Concept explainers
(a).
Thedischarge of charged electroscope by shining in ultraviolet light
(a).
Answer to Problem 1CQ
Solution: The discharge of charged electroscope by shining in ultraviolet light is due to
Explanation of Solution
Given Info: Negatively charged electroscope
Ultraviolet light
The discharge is due to Photoelectric effect. According to Einstein’s photoelectric equation, each photon in incident light will bring an electron on top of metal surface (which is called as work function) and the leftover energy of light is given to photo electrons as kinetic energy. In the present case, incident light energy of ultraviolet should be greater than work function of negatively charged electroscope and this causes discharge.
Conclusion:
Thedischarge of charged electroscope by shining in ultraviolet lightis due to Photoelectric effect.
(b).
Thedischarge of uncharged electroscope by shining in ultraviolet light may not make positively charged electroscope.
(b).
Answer to Problem 1CQ
Solution:
In the present case of uncharged electroscope, incident light energy of ultraviolet should be lesser than work function and this cause non -discharge of electroscope. Hence, the electroscope may not become positive.
Explanation of Solution
Given Info: Uncharged electroscope
Ultraviolet light
In the present case of uncharged electroscope, incident light energy of ultraviolet should be lesser than work function and this cause non discharge of electroscope. Hence, the electroscope may not become positive.
Conclusion:
In the present case of uncharged electroscope, incident light energy of ultraviolet should be lesser than work function and this cause non discharge of electroscope. Hence, the electroscope may not become positive.
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Chapter 38 Solutions
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