The ratio of the pressure power to the absorption power of all substances for a particular wavelength is the same at given temperature. The ratio is known as

The ratio of the Emissive power to the absorption power of all substances for a particular wavelength is the same at given temperature. The ratio is known as

The ratio of true power to apparent power, is

The ratio of tru epower to apparent power, is

The ratio of energy and temperature is known as ………..

From Kirchoff's law the ratio of emissive power and absorption power of all bodies-

From Kirchoff's law the ratio of emissive power and absorption power of all bodies-

The ratio of output power to input power of an elecrtic device is called…….

The ratio of the mass of a certain volume of gas to the mass of an equal volume of hydrogen under the same conditions of temperature and pressure is known as_______