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A beam of light having frequency $v$ is incident on an initially neutral metal of work function $ϕ (h v > ϕ) .$ Then

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all emitted photoelectrons have kinetic energy equal to $(h v - ϕ) .$

all free electrons in the metal, that absorb photons of energy $h v$ completely, may not be ejected out of the metal.

after being emitted out of the metal, the kinetic energy of photoelectrons decreases continuously as long as they are at a finite distance from metal

the emitted photo electrons move with constant speed after escaping from the field of metal.

answer is B, C.

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Detailed Solution

A) All emitted photo electrons have kinetic energies ranging from 0 to $h v - ϕ_{0} .$ Hence false.
B) Some free electron may lose energy within metal due to collision and cannot escape the metal. Hence true

C) Since metal is positively charged it will attracted emitted photoelectrons. Hence true.

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