The phenomenon of photoelectric effect is used in the fol...
The phenomenon of photoelectric effect is used in the following EXCEPT
automatic doors
bugler alarm
electric fire alarm
sound production from film tracks
television cameras
Correct answer is D
No explanation has been provided for this answer.
The pitch of an acoustic device can be increased by ...
Evaporation of a liquid produces cooling of the liquid because the ...
Lodestone is a natural magnet, it points at ...
Formation of hydrogen bubbles at the copper plate of a primary cell is called? ...
23Na + X → 20F + 4He1192 What particle is X in the reaction above?...
The density P of a spherical ball of diameter d and mass m is given by ...