Name a phenomenon or an experiment which proves.
(i) Particle nature of electro-magnetic radiations.
(ii) Wave nature of particles.
(i) State the postulate of Bohr's theory regarding:
(1) Angular momentum of an electron.
(2) Emission of a photon.
(ii) Total energy of an electron orbiting around the nucleus of an atom is always negative. What is the significance of this?
(i) Draw a labelled graph showing variation of relative intensity of X-rays versus their wavelength λ . Mark on the graph.
(ii) State how the value of can be varied.
(i) What is the significance of binding energy per nucleon of nucleus?
(ii) In a certain star, three alpha particles undergo fusion in a single reaction to form nucleus. Calculate the energy released in the reaction in MeV.
(i) Binding Energy is the total binding energy of nucleus divided by number of nucleons inside it.
Higher the average binding energy per nucleon, greater is the stability of nucleus.
Show by drawing labelled diagrams, the nature of output voltages in case of:
(i) A half wave rectifier.
(ii) A full wave rectifier.
(iii) An Amplifier.
(In Each case, input in an ac voltage.)
Circuit diagrams of these devices are not required.