CBSE 2023 · Region 5 · Set 1 · Q20 · 2 marks
How will the De Broglie wavelength associated with an electron be affected when the (i) velocity of the electron decreases ? and(ii)accelerating potential is increased ? Justify your answer.How would the stopping potential for a given photosensitive surface change if (i) the frequency of the incident radiation were increased ? and (ii) the intensity of incident radiation were decreased ? Justify your answer.
How will the De Broglie wavelength associated with an electron be affected when the (i) velocity of the electron decreases ? and
(ii)
accelerating potential is increased ? Justify your answer.
How would the stopping potential for a given photosensitive surface change if (i) the frequency of the incident radiation were increased ? and (ii) the intensity of incident radiation were decreased ? Justify your answer.
Marking-scheme solution
(i) \(\displaystyle \lambda=\mathrm{h} / \mathrm{mv}\)
With decrease in velocity, de- Broglie wavelength increases
(ii) \(\displaystyle \lambda=\frac{\mathrm{h}}{\sqrt{2 m e V}}\)
With increase in accelerating potential, de- Broglie wavelength decreases
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.