Rankers Physics

Photoelectric Effects and deBroglie Equation: Practice Problem & Solution

The velocity of photons is proportional to (where $\upsilon$ = frequency) (1996)
$1/\upsilon$
$\upsilon^2$
$\upsilon^0$
$\sqrt{\upsilon}$

Solution Explained:

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:

The velocity of a photon in vacuum is the speed of light ($c$), which is a constant and independent of its frequency. Thus, it is proportional to $\upsilon^0$.

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Your email address will not be published.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. The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27°C and 127° respectively is :
2. Assertion (A): Strong nuclear force holds protons inside nucleus. Reason (R): Strong nuclear force is not a fundamental force.
3. Assertion (A): In sodium nucleus \(_{11}^{23}\text{Na}\), there are no electrons. Reason (R): Atomic number of sodium is 11.  
4. Energy from the sun is received on the earth at the rate of 2 cal per cm² per min. If average wavelength of solar light be taken at 5500 Å, then how many photons are received on the earth per cm² per min ? \[\left( h=6.6\times 10^{-34}J-s,cal = 4.2 J \right)\]
5. The figure shows different graphs between stopping potential (V0) and frequency (n) for photosensitive surface of caesium, potassium, sodium and lithium. The plots are parallel. Correct ranking of the targets according to their work function, greatest first, will be :