The peak emission from a black body at a certain temperature occurs at a wavelength of 6200 A. On increasing its temperature, the total radiation emitted is increased 16 times. These radiations are allowed to fall on a metal surface. Photoelectrons emitted by the peak radiation at higher temperature can be bought to rest by applying potential equivalent to the excitation potential corresponding to the transition for the level n=4 to n=2 in the Bohr's hydrogen atom. The work function of the metal is given by `alpha/100 eV` where alpha is the numerical constant. Find the value of alpha.

Peak emission from a black body at a certain temperature occures at a wavelength lambda. On increasing its temperature , total radiation emitted is increasing 16 times . At the initial temperature when peak radiation from the black body is incident on a metal surface , it does not cause photoemission from surface . After the increasing the peak radiation from black body caused photoemission. to bring these photoelectrons to rest, a potential equivalent to the excitation energy between n=2 to n=3 Bohr levels of hydrogen atom is required. if eork function of metal is 2.24eV , then value of lambda is [hc=12400eV-Å]

The peak emission from a black body at a certain temprature occurs at a wavelength of 9000 Å . On increase its temperature , the total radiation emmited is increased its 81 times. At the intial temperature when the peak radiation from the black body is incident on a metal surface , it does not cause any photoemission from the surface . After the increase of temperature, the peak from the black body caused photoemission. To bring these photoelectrons to rest , a potential equivalent to the excitation energy between n = 2 and n = 3 bohr levels of hydrogen atoms is required. Find the work function of the metal.

The peak emission from a black body at a certain temprature occurs at a wavelength of 9000 Å . On increase its temperature , the total radiation emmited is increased its 81 times. At the intial temperature when the peak radiation from the black body is incident on a metal surface , it does not cause any photoemission from the surface . After the increase of temperature, the peak from the black body caused photoemission. To bring these photoelectrons to rest , a potential equivalent to the excitation energy between n = 2 and n = 3 bohr levels of hydrogen atoms is required. Find the work function of the metal.

A black body at high temperature emits thermal radiations of

The temperature of a black body becomes half of its original temperature, the amount of radiation emitted by the body will reduce to

In a black body radiation at certain temperature T_1 the wave length having maximum intensity of radiation equals 9000A^@ . When the temperature is increased from T_1 "to" T_2 the total radiation increases 16 times. The peak radiation at T_2 is found to be capable of ejecting photoelectrons. The maximum kinetic energy of photoelectrons is the same as the energy of photon that one gets when one of electron in the M -shall of hydrogen atom jumps to L-shell the work function of the metal will be

If the temperature of a black body becomes half of its original temperature, then the amount of radiation emitted by the body per second will be reduced to