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))/(2) from I_(0) after travelling 2.0 cm inside a target, then its intesity after travelling a distance of 4 cm will be

If the intensity of an X-ray becomes (I_(0))/(2) from I_(0) after travelling 2.0 cm inside a target, then its intesity after travelling a distance of 4 cm will be

Two sinusoidal plane waves of same frequency having intensities I_(0) and 4I_(0) are travelling in the same direction. The resultant intensity at a point at which waves meet with a phase difference of zero radian is

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

Two incoherent sources of light emitting light of intensity I_(0) and 3I_(0) interfere in a medium. Then the resultant intensity at any point will be

A source emits electromagnetic waves of wavelength 3 m . One beam reaches the observer directly and other after reflection from a watersurface, travelling 1.5 m extra distance and with intensity reduced to 1//4 as compared to intensity due to the direct beam alone. The resultant intensity will be :

if the intensity of light is made 4I_0 , then the saturation current will become

if the intensity of light is made 4I_0 , then the saturation current will become