Describe briefly Davisson - Germer experiment which demonstrated the wave nature of electrons.

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by:

Describe and experiment which demonstrates that growth stimulating hormone is produced at the tip of coleoptile.

a. Name the experiment which establishes the wave nature of moving electrons. b. In that experiment, electrons are accelerated through a potential of 54 V and is made to fall normally on the nickel crystal of interatomic separation 0.91 A. Draw the polar graph showing the variation of intensity of the scattered electrons electrons and latitude angle at this potential. c. Calculate the d-Broglie wavelength of the electron.

Describe an experiment to prove that friction depends on the nature of a surface.

With what purpose was famous Davisson-Germer experiment with electrons performed ?