Light from a monochromatic source of wavelength, is incident normally on a small…
Chemistry · JEE Main · NTA Exams — Atomic Structure
Light from a monochromatic source of wavelength, \(\lambda\) is incident normally on a small photo-sensitive surface of area S having work function Φ. If power of the source is W and the distance between the source and the surface is 'a' then
- the number of photons striking the surface per unit time will be \(\left(\frac{\text { WAS }}{4 \pi h c a^{2}}\right)\)
- the maximum energy of the emitted electrons will be \(\frac{1}{\lambda}(h c-\lambda \Phi)\)
- the stopping potential needed to stop the most energetic photons will be \(\frac{e}{\lambda}(h c-\lambda \Phi)\)
- photoemission occurs only if \(0<\lambda \leq \frac{h c}{\Phi}\)
- (i) and (ii) are true
- (ii) and (iii) are true
- (i), (ii) and (iii) are true
- (i), (ii) and (iv) are true
Answer
(D) (i), (ii) and (iv) are true
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