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Statement (A): Every photon striking the...

Statement (A): Every photon striking the metal and colliding with the electron uses part of its energy to remove the electron from the metal surface, the remaining part is used to impart K.E. to the electron.
Statement (B): The minimum energy needed to remove the electron from the metal surface is called work function.
Statement (C): There is no time lag between incidence of photon and emission of photoelectrons.

A

A, B are only true

B

B, C are only true

C

A, C are only true

D

A, B, C are true

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will evaluate each statement based on the principles of the photoelectric effect. ### Step-by-Step Solution: 1. **Understanding Statement (A)**: - The statement claims that every photon striking the metal collides with an electron, using part of its energy to remove the electron from the metal surface, while the remaining part is used to impart kinetic energy (K.E.) to the electron. - According to the photoelectric effect, when a photon with energy \( h\nu \) strikes a metal surface, it transfers energy to an electron. The energy required to remove the electron from the surface is known as the work function (\( \phi \)). The excess energy after overcoming the work function is converted into kinetic energy of the emitted electron. - Therefore, Statement (A) is **True**. 2. **Understanding Statement (B)**: - This statement defines the work function as the minimum energy needed to remove the electron from the metal surface. - This definition aligns with the established concept in physics. The work function (\( \phi \)) is indeed the minimum energy required for an electron to escape from the surface of a metal. - Thus, Statement (B) is **True**. 3. **Understanding Statement (C)**: - Statement (C) asserts that there is no time lag between the incidence of a photon and the emission of photoelectrons. - The process of a photon striking an electron and causing its emission is extremely rapid, typically on the order of \( 10^{-9} \) seconds. This time is negligible for practical purposes, leading to the conclusion that the process can be considered instantaneous. - Therefore, Statement (C) is also **True**. ### Conclusion: All three statements (A, B, and C) are correct based on the principles of the photoelectric effect. ### Final Answer: - Statement (A): True - Statement (B): True - Statement (C): True
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