A Beam Of Green Light  gives Energy At The Rate Of 1 Js–1 to A Surface Where It Is Fully Absorbed. How Many Photons Reach The Surface Per Second? If Every 100 Photons Emit One Electron, How Much Current Will Flow From The Surface? 

X-rays which can penetrate through longer distance in substances are called.

The target in an X-rays tube should be a:

The maximum frequency of the X-rays produced in an X-ray tube

Which one of the following parameters of the emitted X-rays increases when the potential difference between the electrodes of an X-ray tube is increased?  

Calculate the energy of a photon, in electron-volt (eV) and in watt-hour (W h), of wavelength 6600 Å. 

An X-rays tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Å. What is the maximum energy of a photon in the radiation? What is the order of accelerating voltage (for electrons) required in such a tube? 

In an accelerator experiment on high-energy collisions of the electrons with positrons, a certain event is interpreted as the annihilation of an electron-positron pair of total energy 10.2 BeV into two -rays of equal energy. Find the wavelength associated with each -ray. 

Energy from Sun is received on earth at the rate of . If average wavelength of solar light is taken as 550 nm, then how many photons are received on earth per meter² per second? 

Monochromatic light of frequency  is produced by a laser. The power emitted is . What is the energy of a photon in the light beam?

Calculate the number of photons emitted per second by a transmitter of 10 kW power, emitting radio waves of wavelength 500 m.