A photocell shows photoelectric effect when green light shines on it. Which of the following is correct if a green light is replaced by a blue light?
Electron emission would get stopped.
Electrons are emitted with more velocity.
Electrons are emitted with less velocity.
Electrons are emitted with same velocity.
D?
Electrons are emitted with more velocity.
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Yes, D is correct - Electrons are emitted with the same velocity.
The photoelectric effect is a phenomenon where electrons are emitted from a material when it absorbs photons (particles of light). The velocity of the emitted electrons depends on the energy of the photons, but not on the color of the light itself. In other words, the photoelectric effect is independent of the color of light.
To understand why, we need to remember that the energy of a photon is directly proportional to its frequency or inversely proportional to its wavelength. Green light and blue light have different wavelengths and frequencies, but the energy of the photons remains the same.
When a photocell is exposed to green light, the photons with their specific energy cause the emission of electrons with a certain velocity. If we replace the green light with blue light, the energy of the photons will still be the same, resulting in the emission of electrons with the same velocity. Therefore, the correct answer is that electrons are emitted with the same velocity.