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? 

The frequency of  line of a source of atomic number Z is proportional to

A direct X-ray photograph of the intestines is not generally taken by the radiologists because :

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. 

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