Concepts Of Physics MCQ Edition [Volume 2]PhysicsPhotoelectric Effect and Wave–Particle Duality

Upon increasing the intensity of a light source,

Options

Athe quantity of photons emitted by the source per unit time increases
Bthe total energy of the emitted photons per unit time increases
Cphotons of higher energy are emitted
Dphotons travelling at a faster speed are emitted

Correct answer

B. the total energy of the emitted photons per unit time increases

Step-by-step solution

Intensity of light is defined as the total energy emitted per unit area per unit time. I = E A t = n h A t where n is the number of photons emitted in time t and is the frequency of light. When the intensity of a given light source is increased, its frequency remains constant. Therefore, the number of photons emitted per unit time ( n t ) increases. The total energy of the emitted photons per unit time is the power P = n h t , which also increases as n increases. The energy of an individual photon is E = h , which

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