If the surface temperature of the sun is assumed to be 6150 K, find the wave length of maximum intensity in the sun’s radiation taking Wien's constant `2.88 xx 10^-3mk`.

The surface temperature of a black body is 1200 K. What is the wavelength corresponding to maximum intensity of emission of radiation if Wien's constant b = 2.892 xx 10^-3 mk ?

Analysis of the sun's spectrum shows that the wave length of maximum intensity is 4750 A^@ . Taking Wien's constant as 2.9 xx 10^-3 mk , find the surface temperature of the sun.

If the period of a wave is 2 times 10^-3 s, find the frequency of the wave.

A planet with the diameter and mass, both one third of those of the earth has surface temperature around 1000 K. Is it possible to find oxygen molecules around the atmosphere of the planet? (Given: Boltzmann constant = 1.38 xx 10^-23 J/K , Mass of oxygen molecule = 5.3 xx 10^-26 kg )

A 100 watt filament loses all its power by radiation when it is heated to a temperature of 2500 K. If the diameter of the filament is 0.2 mm and the surface emissivity of the filament is 0.5, find the length of the filament. (Stefan's constant sigma = 5.67 xx10^-8 W/m^2k^4 )

What is the peak wavelength of radiation emitted by a black body at temperature 40^@C (b = 2.898 xx 10^-3 mK )

The surface of a black body is at a temperature 727^(@)C and its cross section is 1m^(2) Heat radiated from this surface in one minute in Joules is (Stefan's constant =5.7 xx 10^(-8) W//m^(2)//k^(4)) .

Assuming that the temperature at the surface of the Sun is 6000 K, find out the size of a virtual star (in terms of the size of Sun) whose surface temperature is 3000 K and the power radiated by the virtual star is 25 times the power radiated by the Sun. Treat both, the Sun and virtual star as a blackbody.

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U_(1) , at wavelength 500 nm is U_(2) and at 1000 nm is U_(3) , Wien's constant, b=2.88xx10^(6) nm K, which of the following is correct ?