Physics questions
20027 published questions with worked solutions.
- The total radiant energy per unit area normal to the direction of incidence, received at a distance R from the centre of a star...
- At 273^ , the emissive power of a perfect black body is R. What is its value at 0^ ?
- A black body at 227^ radiates heat at the rate of 7 cal ,cm^ -2 ,s^ -1 . At a temperature of 727^ , the rate of heat radiated (in...
- The rate of emission of a black body at 0^ is R, its rate of emission at 273^ is
- The rectangular surface of area 8 cm 4 cm of black body at a temperature of 127^ emits energy at the rate of E per second. If the...
- The temperature of a black body is increased by 50%, then the percentage of increase of radiation is approximately
- A planet is at an average distance d from the sun and its average surface temperature is T. Assume that the planet receives...
- The wavelength of maximum intensity of radiation emitted by a star is 289.8 nm and the radiation intensity of the star is (Take,...
- A perfect gas at 27^ C is heated at constant pressure so as to double its volume. The increase in temperature of the gas will be
- The temperature of a gas contained in a closed vessel of constant volume increases by 1^ C when the pressure of the gas is...
- A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an...
- At constant temperature, the volume of a gas is to be decreased by 4 %. The pressure must be increased by
- At what temperature, the molecule of nitrogen will have same rms velocity as the molecule of oxygen at 127^ C ?
- At what temperature, the rms velocity of helium molecules will be equal to that of hydrogen molecules at NTP?
- If the rms velocity of a gas is v, then
- Diatomic molecules like hydrogen have energies due to both translational as well as rotational motion. From the equation in...
- Two moles of helium are mixed with n moles of hydrogen. The root mean square speed of the gas molecules in the mixture is 2 times...
- One mole of a monoatomic ideal gas is mixed with one mole of a diatomic ideal gas. The molar specific heat of the mixture at...
- Three perfect gases at absolute temperatures T_1, T_2 and T_3 are mixed. The masses of molecules are m_1, m_2 and m_3; and the...
- Six molecules speeds 2 unit, 5 unit, 3 unit, 6 unit, 3 unit and 5 unit, respectively. The rms speed is