A cathode ray tube is operated at 2,500 V. What is the speed of electrons emitted?

Define the term work function of a metal. The threshold frequency of a metal is f_0 when the light of frequency 2f_0 is incident on the metal plate, the maximum velocity of electrons emitted is v_1 , when the frequency of the incident radiation is increased to 5f_0 , the maximum velocity of electrons emitted is v_2 . Find the ratio of v_1 and v_2 .

If the intensity of incident radiataions on a metal is doubled, what happens to the K.E. of electrons emitted.

An electric refrigerator rated 500 W operates 24 hours/day. What is the cost of the energy to operate it for 20 days at Rs.2.00 per kWh?

The stopping potential in an experiment on the photoelectric effect is 1.5 V. What is the maximum kinectic energy of the photoelectrons emitted?

An electron is accelerated through a potential differrence of 300 V. What is its energy in electron volts.

Define the term work function of a metal. The threshold frequency of a metal is 2f_0 is incident on the metal plate, the maximum velocity of electrons emitted is v_1 , when the frequency of the incident radiation is increased of 5f_0 the maximum velocity of electrons emitted is v_2 . Find the ratio of v_1 to v_2 .

The photoelectric cut-off voltage in a certain experiment is 1.5 V. what is the maximum kinetic energy of the photoelectrons emitted?