Ncert Exercises & Solutions

Four identical monochromatic sources A, B, C, D as shown in the (figure) produce waves of the same wavelength $λ$ , and are coherent. Two receivers, $R_{1}$ and $R_{2}$ , 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?

$R_{1} B = d = R_{2} B$
$AB = BC = BD = λ / 2$

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