Source and observer both start moving simultaneously from origin, one along x-axis and the other along y-axis with speed of source = twice the speed of observer. The graph between the apparent frequency observed by observer f and time t would approximately be: Image
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Question

Source and observer both start moving simultaneously from origin, one along x-axis and the other along y-axis with speed of source = twice the speed of observer. The graph between the apparent frequency observed by observer f and time t would approximately be: Image

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G1 Physics · Accepted Answer

Step 1: For light, use relativistic Doppler when speed is a sizable fraction of c; for v ≪ c, Δλ/λ ≈ v/c. Step 2: Red shift means recession and blue/violet shift means approach. Step 3: Substitute the given speed. Final: B: Image 2.