Please solve 12

Please solve 12 Numericals in Physics 11. Calculate the voltage at which a cathode ray tube is operating if energy of the cathode ray is 10 Kev. Ans. KV. 12. If a moving electron has an energy 910 eV. then what will be its vel├Žity ? (Neglecting the variation of mass) Ans. 17-88 x 106m/sec. 13. find out the ionisation potential of oxygen if the energy required 0 a pair of ions in oxygen is 2-56 x 10-18 joule. Ans. 16 volt. 14. If the wave length of a photon is

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