Question

experiment of photocell​

Answer 1

Figure 1. The photocell experiment is designed to measure the stopping potential on the anode (collector) that stops the flow of electric current from the cathode by applying a negative potential on the anode. The incident light is reflected on a Silicon cathode plate with an electric potential that is proportional to the difference between temperature of the source of radiation and the cathode plate. The stopping voltage is recorded by the voltmeter and the temperature of the source of radiation is determined by the wavelength of the incident radiation through Wien's law of radiation. 



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Answer 2

 

Experiment # 1Photoelectric EffectIntroduction:

When high energy light particles fall on a solid body, the body absorbs energy from light particles and its electrons excites and left the surface of body. This phenomenon is called photoelectric effect.And electrons emitted are called photo electrons.

Explanation:

Einstein’s hypothesis

:Einstein gives theory about the behavior of light which is as follows: “When a light illuminates a metal plate, photons collide with electrons in the plate and, depending on the energy needed to eect the electron from the metal, the electrons are either free or remain stuc! in the metal

.”

Observations:

The theory of the photoelectric effect must explain the experimental observations of the emission of electrons from an illuminated metal surface.

 

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"or a given metal, there exists a certain minimum fre#uency of incident radiation below which no photoelectrons are emitted. This fre#uency is called the threshold fre#uency.

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Above the threshold fre#uency, the maximum !inetic energy of the emitted photoelectron depends on the fre#uency of the incident light, butis independent of the intensity of the incident light.

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"or a given metal and fre#uency of incident radiation, the rate at which  photoelectrons are eected is directly proportional to the intensity of the incident light.