Question

The Doppler effect - the shift in frequency/wavelength of a sound source when there is relative motion between source & observer - and a Sonic Boom - a conical region of compression that forms around the sound source when its speed exceeds the speed of sound in the medium of the source, and results in an observed "boom" when part of the cone passes the observer's location - are two interesting, common, as well as connected phenomena seen this week.

For the Doppler effect, give and discuss briefly two applications, see if you can do one stemming from nature and one technology (man-made).

For the sonic boom, see if you can give two occurrences stemming from nature and two from man-made situations.

Please no handwritten or picture respones - only typed replies.

Answer 1

Examples of doppler shift

In Technology term, there are so many example. The best example would be of a movinf vehicle. When the vehicle approaches an observer, the frequency of sound waves increases and when the vehicle goes sway, the frequency decreases.

In nature term, when we talk about galaxies and stars, we can make sue of doppler shift. The galaxies and stars moving away from us will be slightly red shifted and those moving towards us will be blue shifted. That's how doppler shift and doppler effect comes into picture

------------------------------------------------------------------------------------------------------------------

Sonic Boom - We all have scene a sonic boom trailing behind a supersonic aircraft. That's a great phenomena to happen.

Example (natural)

A natural sonic boom can be a thunder when lightning ionizes air and as a result expands supersonically. The other example can be fast moving meteor, when they enter atomosphere of any planet, they create sonic booms as they interact with air particles.

Man made example are plenty like aircrafts, rockets during reentry. bullets etc.