Study the images shown in Figure 9 below carefully and answer the questions that follow. (All three…
Study the images shown in Figure 9 below carefully and answer the questions that follow. (All three surfaces have same work function $= 2\cdot3\text{eV}$)
(i)
Why are no photoelectrons emitted in image ‘A’?
(ii)
Which image corresponds to the highest stopping potential?
(iii)
If the photon energy in image B $= 2\cdot8\text{ eV}$, calculate the maximum kinetic energy of the emitted photo electrons.
Answer
Answer (i)
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No photoelectrons are emitted in image A because the energy of the incident photons is less than the work function ($2\cdot3\text{ eV}$) of the metal surface.
Answer (ii)
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Image C corresponds to the highest stopping potential, because the emitted photoelectrons have the highest kinetic energy (indicated by longer emission tracks / higher photon energy).
Answer (iii)
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$K_{\max} = E - W_0 = 2\cdot8\text{ eV} - 2\cdot3\text{ eV} = 0\cdot5\text{ eV}$.
Final answer: 0.5 eV
From ISC 2027 Specimen Physics Paper 1, question 16.