Question

According to Huygens principle the phase difference between oscillations of any two particles on a same wave front is ______ rad.

• A. $\pi/2$
• B. $\pi$
• C. 0
• D. $2\pi$

Hint:

Think of a "wavefront" like a row of soldiers marching in step. Every soldier in that row has the exact same "phase" (left foot down at the same time), so the difference between them is zero.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
A wavefront is defined as the locus of all points in a medium that are oscillating in the same phase at a given instant of time.
Step 2: Formula Application:
Phase difference ($\phi$) = $\phi_1 - \phi_2$. Since all points on a wavefront are in the same phase, $\phi_1 = \phi_2$.
Step 3: Explanation:
By definition, if all particles are at the same stage of vibration (e.g., all at the crest or all at the trough), the difference in their phase is zero.
Step 4: Final Answer:
The phase difference is 0 rad.