The work function of a metal is $\phi$. Light of frequency $2

u$(where$

u = \frac{\phi}{h}$) is incident on the metal. If the frequency is now reduced to$\frac{3

u}{2}$, and the intensity is doubled, what will be the ratio of the new saturation current to the original saturation current?

Given that a photon of light of wavelength 10,000 $\mathop A\limits^ \circ$ has an energy equal to 1.23 eV. When light of wavelength 5000 $\mathop A\limits^ \circ$ and intensity ${I_0}$ falls on a photoelectric cell, the surface current is $0.40 imes {10^{ - 6}}$ A and the stopping potential is 1.36 V, then the work function is

The current in a photocell is directly proportional to the:

A ratio transmitter operates at a frequency 880 kHz and a power of 10 kW. The number of photons emitted per second is

Which metal is commonly used as the cathode in a photocell due to its low work function?

A photo cell is receiving light from a source placed at a distance of $1\;m.$ If the same source is to be placed at a distance of $2\;m,$ then the ejected electron

When the light source is kept $20\;cm$ away from a photo cell, stopping potential $0.6\;V$ is obtained. When source is kept $40\;cm$ away, the stopping potential will be

The ratio of the de Broglie wavelengths of an electron of energy $10\;eV$ to that of person of mass $66\;kg$ travelling at a speed of $100\;km/hr$ is of the order of

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

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

A photocell is illuminated by a monochromatic light source with intensity $I$ and frequency $

u$. If the intensity is doubled while keeping the frequency constant, which of the following statements is TRUE regarding the photocurrent and stopping potential?