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/secQ2 An electron with K.E. 5 eV is incident on a hydrogen atom in its ground state. The collisiona)must be elasticb)may be partially elasticc)must be completely inelasticd)may be completely inelastic

Kevin Nash , 11 Years ago

Grade upto college level