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A cylindrical source of light which emit...

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=6.4xx10^(-34) J//sec]`

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