1.5 mW of 400 nm light is directed at a photoelectric cell. If 0.1% of the incident photons produce photoelectrons, the current in the cell is:

In an experiment, a tungsten cathode that has a threshold wavelength of 2300 Å is irradiated by ultraviolet light of wavelength 1800 Å. The maximum energy of emitted photo-electrons will be:

If the rate of emission of energy from a star is 2.7 x 10^36 J/sec. The rate of loss of mass in the star will be :

A material whose K absorption edge is 0.15 Å is irradiated with 0.1 Å X-rays. The maximum kinetic energy of the photoelectrons that are emitted from the K-shell is :

All electrons ejected from a surface by incident light of wavelength 200 nm can be stopped before travelling 1 m in the direction of a uniform electric field of 4N/C. The work function of the surface is:

Light of wavelength 400 nm is incident continuously on a cesium ball (work function 1.9 eV). The maximum potential to which the ball will be charged is:

Light rays of wavelengths 6000 Å and of photon intensity 39.6 watt/m2 are incident on a metal surface. If only one percent of photons incident on surface emit photoelectrons, then the number of electrons emitted per second per unit area from the surface will be: (h = 6.64 x 10^-34 Js, velocity of light = 3 x 10^8 m/s)