The minimum amount of energy required to emit electrons from a metal surface is called
Ionisation Energy
Dissociated Energy
Cohesive Energy
Work Function
Which of the factor is not affecting the rate of thermionic emission?
Nature of metal surface
Temperature of surface
Surface area of metal
Length of the metal
Which of the following is most harmful for the human being?
α Particle
β Particle
γ Particle
Light rays
