A metal surface is illuminated by light of frequency $2 imes 10^{15}$ Hz. The work function of the metal is $5$ eV. Which of the following statements is correct regarding the emission of photoelectrons?

The rate of 396 of a black body at ${0^0}C$ is E j/s. The rate of 396 of this black body at ${273^0}C$ will be

A Sphere, a cube, and a thin circular plate, all made of the same material and having the same mass, are initially heated to a temperature of ${200^0}C$. When left in air at room temperature, the following cools fastest

In which process, the rate of transfer of heat is maximum

In which process, the rate of transfer of heat is maximum

Temperature of a black body increases from${327^0}C$ to${927^0}C$ , the initial energy possessed is 2KJ , what is its final energy

A liquid cools down from ${70^0}C$ to ${60^0}C$ in 5 minutes . The time taken to cool it from ${60^0}C$ to ${50^0}C$ will be

A calorimeter filled with hot water cools from ${60^{\rm{o}}}C\,\,\,to\,\,\,{50^{\rm{o}}}C$ in 4 min and ${40^{\rm{o}}}C\,\,\,to\,\,\,{30^{\rm{o}}}C$  in 8 min. The temperature of surrounding is

The temperature of a piece of metal is increased from 27$^ \circ C$ to 84$^ \circ C$. The rate at which energy is radiated is increased to

The temperature of a metal block is increased from ${27^0}C$ to ${84^0}C$. The rate of the radiated energy from the block will increase approximately

A black body at a temperature of ${227^0}C$ radiates heat at the rate of 5 cal $c{m^{ - 2}}{s^{ - 1}}$. At a temperature of ${727^0}C$ the rate of heat radiated per unit area in $calc{m^{ - 2}}{s^{ - 1}}$ cal is