Tag: laws of heat transfer
Questions Related to laws of heat transfer
The temperature of the black body that radiates heat at a rate of $459.27 \times 10^4 W m^{-2}$ is:
Which one of the following is the characteristic of Planck's quantum theory of radiation?
Pervost's theory of heat exchange is not applicable at temperature
Two spheres made of same material have radii in the ratio 2 : 1. If both the spheres are at same temperature, then what is the ratio of heat radiation energy emitted per second by them?
A temperature of a body is ${400^ \circ }$ C. Assuming the surrounding temperature to be negligible. At what temperature will body emit double energy radiation?
If the temperature of a hot body is increased by $50\%$, then the increase in the quality of emitted heat radiation will be
If the operating voltage of X-ray tube is $50$kV then velocity of X-ray?
The hydrogen atom in its ground state is excited by means of monochromatic radiation of energy $12.75ev$. How many different lines are possible in the resulting spectrum? You may assume the ionization energy for hydrogen atom as $13.6\ eV$
If $c$ is the velocity of electromagnetic radiation $e$ is the charge of an electron $m$ is the mass of an electron and $h$ is the Planck's constant, then the combination of these universal constant that is dimensionless, is
The radiation corresponding to 3 $\rightarrow $ s 2 transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of $3 \times 10 ^ { - 4 } T$ . If the radius of the largest circular path followed by these electrons is 100 mm, the work function of the metal is close to