A tuning fork of frequency 400 Hz is moved away from a stationary observer and toward a flat wall in a positive direction with a speed of 2.0 m.s–1. Assume the speed of sound in air to be 340 m.s–1. a) Determine the apparent frequency of the unreflected sound waves coming directly to the observer. b) Determine the apparent frequency of the sound waves coming to the observer after reflection from a flat wall.

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Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.