Given instructions same as in chapter 1.
Assertion: Photoelectric effect demonstrates the particles nature of light.
Reason:The number of photoelectrons is proportional to the frequency of light.

Given instructions same as in chapter 1. Assertion: For photoelectric effect to take place, the frequency of incident of incident radiations should be more than threshold frequency of a given metal Reason: 1/2 mv^2=h(v-v_0) .

General instructions same as in chapter 1. Assertion: An atom has equal number of electrons and protons. Reason:In an atom there are equal number of electrons, protons and neutrons.

General instructions same as in chapter 1. Assertion:Rydberg's constant varies with mass number of a given element. Resaon:The reduced mass of the electron is dependent on a given element.

General instructions same as in chapter 1. Assertion:An electron jumps from lower to higher orbit in an atom. Reason:The electron absorbs energy to jump from lower to higher orbit.

General instruction same as in chapter 1. Assertion: Electrons move away from a low potential to high potential region. Reason:Because electrons has negative charge.

Given instructions same as in chapter 1. Assertion:Radio waves can be polarised. Reason:Sound waves in air are longitudinal in nature.

Given instructions same as in chapter 1. Assertion: Any substance can be used for the emission of photoelectrons. Reason: Radiations of suitalbe frequency (more than threshold frequency) should be available.

Photoelectric effect When light of sufficiently small wavelength is incident on a metal cathode, it may emit electsons called photoelectrons. This is called photoelectric effect. Above threshold frequency, the stopping potential and hence the energy of the photoelectrons is directly proportional to the frequency. Slope of graph is given by

Photoelectric effect When light of sufficiently small wavelength is incident on a metal cathode, it may emit electsons called photoelectrons. This is called photoelectric effect. Above threshold frequency, the stopping potential and hence the energy of the photoelectrons is directly proportional to the frequency. In the given figure, we see the variation of stopping potential with the frquency of incident radiation for three metals A, B and C Which of these metals A, B or C are suitable for photoelectric cell?