Please solve 13 Numericals in Physics
11. Calculate the voltage at which a cathode ray tube is operating if
energy of the cathode ray is 10 Kev.
12. If a moving electron has an energy 910 eV. then what will be its
velæity ? (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