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A cylindrical source of light which emits radiation radially (from curved surface) only, placed at the centre of hollow, Metallic cylindrical surface, as shown in diagram.
The power of source is 90 watt and it emits light of wavelength $4000 Å$ only. The emitted photons strike the metallic cylindrical surface which results in ejection of photoelectrons. All ejected photoelectrons reaches to anode (light source). The magnitude of photocurrent (in amp) is : [Given $h = 6.4 \times 10^{- 34} J / \sec]$ .

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answer is 10.

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Detailed Solution

No. of photoelectons emitted

$= \frac{90}{3} \times \frac{4000 \times 10^{- 10}}{6.4 \times 10^{- 34} \times 3 \times 10^{8}} = \frac{1}{1.6} \times 10^{20}$

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