The process by which electrons are emitted by a hot metal surface is known as:
Boiling
Evaporation
Conduction
Thermionic emission
In totally reflecting prism one angle is of:
45°
90°
180°
120°
The value of acceleration is simple harmonic motion at mean position is:
Maximum
Zero
10 N
Both a and b
In compound microscope, the objective have focal length than eye-piece:
Smaller
Larger
Equal
Equal and larger