Physics questions
20027 published questions with worked solutions.
- The root mean square velocity of gas molecules at 27^ C is 1365 m ,s^ -1 . The gas is
- If mass of He is 4 times that of hydrogen, then mean velocity of He is
- The temperature of a given mass is increased from 27^ C to 327^ C . The rms velocity of the molecules increase
- If 1 mole of a monoatomic gas ( = 5 3 ) is mixed with 1 mole of a diatomic gas ( = 7 5 ), the value of for the mixture is
- If universal gas constant is R, the essential heat to increase from 273 K to 473 K at constant volume for ideal gas of 4 mol is
- If temperature of black body increases from 300 K to 900 K , then the rate of energy radiation increases by
- The radiation emitted by a star A is 10000 times that of the sun. If surface temperatures of sun and star A are 6000 K and 2000 K...
- Three objects colored black, grey and white can withstand hostile conditions at 2800^ C . These objects are thrown into furnace,...
- A black body radiates at two temperatures T_1 and T_2 such that T_1 < T_2. The frequency corresponding to maximum energy is
- In which mode of transmission, the heat waves travel along straight line with the speed of light?
- A black body at a high temperature T radiates energy at the rate of U (in W ,m^ -2 ). When the temperature falls to half (i.e. T...
- An ideal black body at room temperature is thrown into a furnace. It is observed that,
- On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum...
- A spherical black body with a radius of 12 cm radiates 450 W power at 500 K . If the radius were halved and the temperature...
- The power radiated by a black body is P and it radiates maximum energy at wavelength _0. If the temperature of the black body is...
- For a gas, R C_V = 0.4, where R is universal gas constant and C_V is the molar specific heat at constant volume. The gas is made...
- Two spherical black bodies of radius r_1 and r_2 with surface temperature T_1 and T_2 respectively, radiate same power, then r_1...
- The root mean square velocity of molecules of a gas is 200 m/s . What will be the root mean square velocity of the molecules, if...
- If C_p and C_v are molar specific heats of an ideal gas at constant pressure and volume, respectively. If is the ratio of two...
- The equation of state for 2 g of oxygen at a pressure p and temperature T, when occupying a volume V will be [MHTCET 2021]