Exams › SSC CGL (Prelims) › General

What happens to the perceived frequency when both the source and the listener move with the same speed in the same direction?

1. It increases
2. It decreases
3. It remains unchanged
4. It fluctuates rapidly

Correct answer: It remains unchanged

Solution

In the Doppler effect, the observed frequency depends on the relative motion between the source and the listener. If both move with the same speed in the same direction, their relative velocity is zero, so the perceived frequency remains unchanged.

Related SSC CGL (Prelims) General questions

• Why are footballs generally spherical in shape?
• When light travels from water to air, which property remains unchanged?
• Difficulty in starting or stopping the motion of a body is due to:
• The bending of sound waves around obstacles is known as:
• Why does food cook faster in a pressure cooker?
• Why are modern tennis rackets commonly made with graphite composites?

⚔️ Practice SSC CGL (Prelims) General free + battle 1v1 →