Thermal Propert...

A body cools from 60°C to 50°C in 10 min. If the room temperature is 25°C and assuming Newton's law of cooling to hold good, the temperature of the body at the end of the next 10 min will be

If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on the earth to what it was previously, will be

Assuming the sun to be a spherical body of radius R at a temperature of T K, evaluate the total radiant power, incident on the earth, at a distance r from the sun

Newton's law of cooling holds good only, if the temperature difference between the body and the surroundings is

Flash light equipied with a new set of batteries, produces bright white light. As the batteries wear out

The wavelength of the radiation emitted by a body depends upon

Two identical bodies have temperatures 277°C and 67°C. If the surroundings temperature is 27°C, the ratio of loss of heats of the two bodies during the same interval of time is (approximately)

The spectral energy distribution of a star is maximum at twice temperature as that of the sun. The total energy radiated by the star is

The coefficient of volume expansion of a liquid is 49 × 10^-5 K^-1. Calculate the fractional change in its density, when the temperature is raised by 30°C.

A bimetallic strip consists of metals X and Y. It is mounted rigidly at the base as shown. The metal X has a higher coefficient of expansion compared to that for metal Y. When bimetallic strip is placed in a cold bath