Four identical monochromatic sources A, B, C, D as shown in the (figure)

produce waves of the same wavelength λ and are coherent. Two receiver

R1 and R2 are at great but equal distances from B.

(i) Which of the two receivers picks up the larger signal?

(ii) Which of the two receivers picks up the larger signal when B is turned off?

(iii) Which of the two receivers picks up the larger signal when D is turned off?

(iv) Which of the two receivers can distinguish which of the sources B or D has been turned off?

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Vishal Baghel | Contributor-Level 10

7 months ago

This is a Long Answer Type Questions as classified in NCERT Exemplar

Explanation-consider the disturbance at the receiver R₁ which is at a distance d from B

Y_A= acos(wt) and path difference is $\frac{λ}{2}$ hence phase difference is $π$ .

Thus the wave R₁ because of B

Y_B= acos(wt- $π$ )= - acoswt here path difference

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Physics Ncert Solutions Class 12th 2023

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