Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

When two monochromatic light of frequency, $\nu$ and $\nu/2$ are incident on a photoelectric metal, their stopping potential becomes $V_s/2$ and $V_s$ respectively. The threshold frequency for this metal is: (2022)
$\frac{3}{2}\nu$
$2\nu$
$3\nu$
$\frac{2}{3}\nu$

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Photoelectric Effects and deBroglie Equation. Understanding the underlying formula is key to arriving at the correct answer below:

Note: The question contains a known typo in its original exam formulation regarding stopping potentials for given frequencies, which mathematically yields anomalous results if solved directly as written. However, applying the standard algebraic relations requested by such formats conventionally points to the intended threshold relations.

Leave a Reply

Your email address will not be published. Required fields are marked *

Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. When a hydrogen atom is raised from the ground state to an excited state, (1995)
2. An electron in the hydrogen atom jumps from state \(n\) to the ground state. The wavelength so emitted illuminates a photo-sensitive material having work function \(4.09\text{ eV}\). If the stopping potential of the photoelectrons is \(8\text{ V}\), the value of \(n\) is
3. Which source is associated with a line emission spectrum? (1993)
4. When photons of energy hv fall on an aluminium plate (of work function E0), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be :
5. Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelength $\lambda_1 : \lambda_2$ emitted in the two cases is: (2012 Pre)