Short Answer TypeName 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) The below graph shows the variation of intensity of X-rays VS. theri wavelength 
.
ii) 
min is inversely proportioned to voltage applied to X ray tube.
(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.
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.
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