# CBSE Class 12-science Answered

**Physic**

Asked by balwansungh111334 | 13 Jul, 2022, 07:34: AM

Expert Answer

Resultant intensity I

_{R}of two waves of radiation of intensities I_{1}and I_{2}is given as .............................(1)

where is intensity of radiation of source P , is intensity of radiation of source Q and is phase difference between sources

At point A , radiation from source P has path difference 5m compare to radiation from source Q.

Phase difference for 5 m path difference = (5/20)2π = π/2

Since radiation from source P is ahead of source Q by phase (π/2) , additional phase lag (π/2) of source P due to path difference

makes the two sources in phase at point A.

Hence if we substitute = 0 in eqn.(1), we get

.................................(2)

At point B , there is no path difference for radiations from source P and source Q.

But initially source P is ahead of source Q by phase (π/2)

Hence if we substitute = (π/2) in eqn.(1), we get

.........................................(3)

At point C , radiation from source P leads a path difference 5m, hence leads additional phase difference (π/2).

Since initially source P is ahead of source Q by phase (π/2), total phase difference becomes π .

Hence if we substitute = π in eqn.(1), we get

............................(4)

If two sources have same intensity , then

Hence using eqn.(2) , eqn.(3) and eqn.(4) , we get the ratio of intensities as

Answered by Thiyagarajan K | 13 Jul, 2022, 09:21: AM

CBSE 12-science - Physics

Asked by balwansungh111334 | 13 Jul, 2022, 07:34: AM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by pramanikachyut33 | 30 Jun, 2021, 09:11: AM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 12 Jun, 2014, 07:02: AM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 12 Jun, 2014, 07:17: AM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 12 Jun, 2014, 07:20: AM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 12 Jun, 2014, 07:28: AM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 08 Jul, 2014, 05:03: PM

ANSWERED BY EXPERT

CBSE 12-science - Physics

Asked by Topperlearning User | 12 Jun, 2014, 07:47: AM

ANSWERED BY EXPERT