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

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 ?

The intensity of X-rays decreases exponentially according to the law I=I_(0)e^(-mux) , where I^(0) is the initial intensity of X-rays and I is the intensity after it penetrates a distance x through lead. If mu be the absorption coefficient, then find the dimensional formula for mu .

Find the thickness of aluminium layer which reduces by half the intensity of a narrow monochromatic X -ray beam if the corresponding mass absorption coefficient is mu//rho = 0.32 cm^(2)//g .

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–

If the intensity of an X-ray becomes I_(0)/3 from I_(0) after travelling 3.5cm inside a target then its intensity after travelling next 7 cm will be

If the intensity of an X-ray becomes I_(0)/3 from I_(0) after travelling 3.5cm inside a target then its intensity after travelling next 7 cm will be

A beam of light of intensity I_(0) falls normally on a transparent plane-parallel plate of thickness l . The beam contains all the wavelengths in the interval from lambda_(1) to lambda_(2) of equal spectral intensity. Find the intensity of the transmitted beam if in this wavelength interval the absorption coefficient is a linear function of lambda , with exterme values x_(1) and x_(2) . The coefficient of reflection at each surfcae is equal to rho . The secondary reflections are to be neglected.

The energy density of air medium is 44.25xx10^(-8)J//m^(3) . The intensity of the electric field in the medium is