C12 DUAL NATURE of MATTER {1} (Fill in the blanks type)

1 The minimum energy required by an electron to just eject from the metal surface so as to overcome the restraining forces at the surface is called ……………..

2. The phenomenon of photoelectric emission was discovered by ……..

3. The maximum kinetic energy of emitted photoelectrons depends on the ………..and nature of …………but is independent of………..

4. The ratio of number of photoelectron ejected to the number of the photons falling on a metal surface is ….. than ………..

5. Photon is not a ………but it is a ………..

6. The velocity of photon in different media is………..

7. The intensity of light depends upon the…....…present in light.

8. The momentum of a photon of energy E is………. and of wavelength is……

9. The de-Broglie wavelength of a photon of an electromagnetic radiation is …………

10. A photon and electron have got same de-Broglie wavelength . Total energy of an electron is…….than that of photon .