question_answer

The peak emission from a black body at a certain temperature occurs at a wavelength of \[\text{6000}\overset{\text{o}}{\mathop{\text{A}}}\,\]. On increasing its temperature, the total radiation emitted is increased 16 times. These radiation are allowed to fall no metal surface. Photoelectrons emitted by the peak radiation at higher temperature can be bought to rest by applying a 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 \[\frac{a}{100}\]eV where a is the numerical constant. Find the value of \[\alpha \].  \[[Take:\,He=12420eV-\overset{\text{o}}{\mathop{\text{A}}}\,]\]

Answer:

159.00