Question

Describe the Experiment to study photoelectric effect and explain the law of photoelectric effect and significance of each

Answer 1

When the light of suitable frequency known as threshold frequency hits a metal surface electrons eject out surface of metal.The electrons will not eject out of metal if light doesnot have suitable frquency.The excess frequency will convert into kinetic energy of electrons.Ejection of electrons does not depend on intensity of light.This experiment was done by Albert Einstein

Answer 2

Answer:

Photoelectric effect: When some photosensitive substances exist exposed to ultraviolet light, electrons exist ejected from their surface which is named photoelectrons. This method is named photoelectric emission.

Explanation:

The experimental setup consists of:

• The evacuated tube consists of the photosensitive plating (emitter) and a metal plate (collector) so that electrons could freely float from emitter to collector without any air resistance
• Photosensitive plate (emitter) to absorb visual light and emit electrons
• Metal plate (collector) to accept electrons ejected from the emitter, thus forming a photoelectric current flow from the collector plate to the emitter plate (contrasting to the discharge of electrons)
• Monochromatic light of short wavelength (representing high frequency)
• Battery to accelerate ejected electrons via a potential difference
• Voltmeter to calculate the potential difference between the emitter and the collector plates due to photoelectric current discharge
• Ammeter to estimate the value of photoelectric current.

Laws of photoelectric emission:

• (i) There is a definite cut-off value of frequency below which electrons cannot be ejected by any substance.
• (ii) Number of emitted electrons is directly proportional to the intensity of the light incident.
• (iii) Kinetic energy of emitted electrons depends on the frequency of incident light on substance.
• (iv) There is no time logging between the incident of light and the emission of electrons.

The digram shows the  Experiment to study of the photoelectric effect,

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