Assertion : Photoelectric saturation current increases with the increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.

A $100\,watt$ light source is emitting radiations of wavelength $5000\,\mathop A\limits^o $. The rate of emission of photons is of the order of

Monochromatic light with a frequency well above the cutoff frequency is incident on the emitter in a photoelectric effect apparatus. The frequency of the light is then doubled while the intensity is kept constant. How does this affect the photoelectric current?

In a photoemissive cell with executing wavelength $\lambda $, the fastest electron has speed $v.$ If the exciting wavelength is changed to $\frac{{3\lambda }}{4}$, the speed of the fastest emitted electron will be

A point source of light is placed at the centre of curvature of a hemispherical surface. The source emits a power of $24\,W$ The radius of curvature of hemisphere is $10\,cm$ and the inner surface is completely reflecting. The force on the hemisphere due to the light falling on it is $……….\times 10^{-8}\,N$.