Question
 How many types of electron emissions exist?

Answer

  1. 4
Explanation:
There are four types of electron emissions, namely, thermionic emission, photoelectric emission, secondary emission, and field emission. These are the different methods of producing electron emissions.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Einstein got Nobel prize on which of the following works(a) Mass-energy relation(b) Special theory of relativity(c) Photoelectric equation(d)  (a) and (b) both
   
   
The forbidden gap in the energy bands of germanium at room temperature is about(a) 1.1 eV(b) 0.1 eV(c) 0.67 eV(d) 6.7 eV
       
Equal torques act on the discs $A$ and $B$ of the previous problem, initially both being at rest. At a later instant, the linear speeds of a point on the rim of $A$ and another point on the rim of $B$ are $v_A$ and $v_B$ respectively. We have:
What is the ratio of the speed of infrared and ultraviolet rays in a vacuum?
A student connects a coil of wire with a sensitive galvanometer as shown in figure. He will observe the deflection in the galvanometer if bar magnet is:
Image
If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then(a) The electron will turn to its right(b) The electron will turn to its left(c) The velocity of the electron will increase(d) The velocity of the electron will remain unchanged
 
 
 
 
The angular dispersion produced by a prism:
Which of the following is correct for light diverging from a point source?
One end of a uniform rod of mass m and length (l) is clamped. The rod lies on a smooth horizontal surface and rotates on it about the clamped end at a uniform angular velocity $\omega.$ The force exerted by the clamp on the rod has a horizontal component:
  1. $\text{m}\omega^2\text{l}$
  2. $\text{Zero.}$
  3. $\text{mg}$
  4. $\frac{1}{2}\text{m}\omega^2\text{l}$
In a region of space having a uniform electric field E, a hemispherical bowl of radius r is placed. The electric flux $\phi$ through the bowl is: