Question

according to youngs experiment, how must waves be vibrating for interference to occur?

• in line
• in phase
• out of phase
• out of line

Explanation:

Young's double-slit experiment demonstrates wave interference. For observable interference (stable, distinct fringes), waves must have a constant phase relationship. While interference can involve both in-phase and out-of-phase interactions, the key requirement from the options is that the sources (and thus waves) must be vibrating in phase (or have a fixed phase difference, which is satisfied by in-phase vibration) to produce a consistent interference pattern. The other options do not describe the necessary vibration condition for interference in this context.

Answer:

in phase