Amonochromatic light beam with a quantum energy value of 4.3 ev is incident upon a photocell. the work function of the photocell is 2.2 ev. what is the maximum kinetic energy of the ejected electrons?

As per Einstein's Photo electric effect theory

the energy which incident in form of photon will be absorbed by the metal surface and some of the energy is released in form of KE of ejected electrons

now from the above equation

explanation:

newton's third law, for every action there is an equal and opposite reaction.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg