The animal emits a pulse of sound (a longitudinal wave) which, after reflection from objects, is detected by the animal, this phenomenon is called echolocation. Echolocation waves emitted by whales have frequencies of about 200,000Hz. (a) What is the wavelength of the whale's wave? (b) If an obstacle is 100m from the whale, how long after the whale emits a wave is its reflection detected? (Bsea water =2x109 N/m2)

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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.