# NEET Questions Solved

A beam of light of wavelength $\mathrm{\lambda }$ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then
(a) N ∝ L and E ∝ L                    (b) N ∝ L and $\mathrm{E}\propto \frac{1}{\mathrm{\lambda }}$
(c) $\mathrm{N}\propto \mathrm{\lambda }$ and E ∝ L                    (d) $\mathrm{N}\propto \frac{1}{\mathrm{\lambda }}$ and $\mathrm{E}\propto \frac{1}{\mathrm{L}}$

(b) Number of photons emitted is proportional to the intensity. Also $\frac{\mathrm{hc}}{\mathrm{\lambda }}={\mathrm{W}}_{0}+\mathrm{E}$

Difficulty Level:

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