Assertion and Reason Question :
Assertion: Doppler effect is due to relative motion between the source and listener.
Reason: Echo is used in RADAR and SONAR.
(a) If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
(b) If both the assertion and the reason are true but the reason is not the correct explanation of the assertion.
(c) If the assertion is true, but the reason is false.
(d) If the assertion is false, but the reason is true.