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Q 1 A horizontal cesium plate ( ) is moved vertically downward at a constant speed v in a room full of radiations of wavelength 250 nm nd abv. Wht shuld be the min value of v so tht vertically upward component of velocity is non positive fr each photo electron? Ans 1.4 * 10^6 m/sec Q2 An electron with K.E. 5 eV is incident on a hydrogen atom in its ground state. The collision a)must be elastic b)may be partially elastic c)must be completely inelastic d)may be completely inelastic


Q 1 A horizontal cesium plate ( ) is moved vertically downward at a constant speed v in a room full of radiations of wavelength 250 nm nd abv. Wht shuld be the min value of v so tht vertically upward component of velocity is non positive fr each photo electron?



Ans 1.4 * 10^6 m/sec



Q2 An electron with K.E. 5 eV is incident on a hydrogen atom in its ground state. The collision 



a)must be elastic

b)may be partially elastic

c)must be completely inelastic

d)may be completely inelastic


Grade:upto college level

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