From these wave properties: Interference (1), Diffraction (2), Refraction (3), R

Question

From these wave properties: Interference (1), Diffraction (2), Refraction (3), Reflection (4), Doppler Effect (5) select the one which explains or can be used to determine the following. (Place the number 1-5 next to each. A number may be used more than once).

A) Determine a possible obstruction in the flow of blood through an artery

B) How a standing wave can occur

C) Using a beat frequency to tune a musical instrument

D) The recession of the stars and galaxies from the earth and each other

E) Why there are no perfect shadows

Explanation / Answer

(a)  Determine a possible obstruction in the flow of blood through an artery

This could be diffraction from small obstruction

(b) How a standing wave can occur

We get this from reflection at another end

(c) Using a beat frequency to tune a musical instrument

That is also reflection of sound from other side

(d) The recession of the stars and galaxies from the earth and each other

This shift is because of Dopplet effect

(e) Why there are no perfect shadows

This is because light bend at the corners and this is called diffraction

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