Plzzz help in both the questions.Need urgent as tests are near.

Plzzz help in both the questions.Need urgent as tests are near. 55. DISTANCE O LOSEST APPROACH The distance oi closest approach (in m) ot an (I-particle travelling towards gold nucleus (AL No. = 79) with kinetic energy 2.4 MeV_ (4) 0.5 (3) 10 With what velooity should an a-particle travel towards the nucleus of a copper atom so as to arrive a:' a distance 10¯13 m from the nucleus of the copper atom? (1) 6.5x (3) 6.5 x 105 cm/sec. H2É6.5 x 106 mJsec (4) 6.5 x 105 mlsec PLANCK'S QUANTUM THEORY A bulb emits light of wavelength 4500Å. The bulb is rated as 150 watt and 8% of the energy is are emitted by the bulb per second?