The intensity of X–rays of wavelength 0.5Å reduces to one fourth on passing through 3.5 mm. Thickness of a metal foil. The coefficient of absorption of metal will be–

How many times will the intensity of a narrow X -ray beam of wavelength 20pm decrease after passing through a lead plate of thickness d = 1.0 mm if the mass absorption coefficient for the given radiation wavelength is equal to mu//rho = 3.6 cm^(2)//g ?

When X- ray of wavelength 0.5 Å pass through 7 mm thick aluminium sheet then their intensity reduces to one fourth. Find coefficient of absorbtion of aluminium for these X-rays.

The intensity of gamma - from a source (I_(0)) reduces to I_(0)//8 after passing through 48 mm thick sheet of lead. The thicness of the sheet for obtaining intensity equal to I_(0) / 2 will be-

The intensity of an X-ray beam reduces to 36.8% of its initial intensity after traversing a gold film of thickness 5xx10^(-3)m . Its absorption coefficient is

For intensity I of a light of wavelength 5000 Å the photoelectron saturation current is 0.40 mu A and stopping potential is 1.36 V , the work function of metal is

For intensity I of a light of wavelength 5000 Å the photoelectron saturation current is 0.40 mu A and stopping potential is 1.36 V , the work function of metal is

The inteisity of gamma radiation from a given source is I_(0) . On passing throug 37.5 mm of lead it is reduced to I_(0) // 8. the thickness of lead which will reduce It to I_(0) //2 is -