Test: Planck’s Law - Chemical Engineering MCQ

A small body has a total emissive power of 4.5 kW/m². Determine the wavelength of emission maximum

The sun emits maximum radiation of 0.52 micron meter. Assuming the sun to be a black body, Calculate the emissive ability of the sun’s surface at that temperature

The law governing the distribution of radiant energy over wavelength for a black body at fixed temperature is referred to as

The Planck’s constant h has the dimensions equal to

Planck’s law is given by

A furnace emits radiation at 2000 K. Treating it as a black body radiation, calculate the monochromatic radiant flux density at 1 micron m wavelength

A metal sphere of surface area 0.0225 m² is in an evacuated enclosure whose walls are held at a very low temperature. Electric current is passed through resistors imbedded in the sphere causing electrical energy to be dissipated at the rate of 75 W. If the sphere surfaces temperature is measured to be 560 K, while in steady state, calculate emissivity of the sphere surface