Do not write it down Next, share your ideas, observations, and experiences regar
ID: 1643827 • Letter: D
Question
Do not write it down Next, share your ideas, observations, and experiences regarding waves and sound in Discussion. Respond to the following . . Describe standing waves on a string and give examples In your own words, explain standing sound waves, interference, beats, and give examples. - In your own words, explain Doppler's effect and give examples Beginning Friday, July 7, 2017 and by Saturday, July 8, 2017, post your initial response to Unit 12 Discussion. Continue to respond to your peers responses and contribute to our discussion on waves and sound through Monday, July 10, 2017 lowa
Explanation / Answer
(a) Standing wave on a string - When we tie a string tightly b/w two fixed ends and give it a pluck at one end, a wave
will form which will travel from plucked end to another end. This wave is called standing wave which is formed on a
string.
Example - our every day life, we see many examples of such wave.
When we play guitar, standing waves form on guitar cord.
When we change tension in string means tight or loose string, the speed of wave will change.
These Standing waves are transverse waves. lt means direction of propagation is at perpendicular to amplitude of
wave.
(b) Standing sound wave - These waves are longitude waves which need air to propagate.
To generate sound wave we need a closed pipe (whether closed at both end or open at one end) or open pipe at
both ends.
example - voice production by our vocal cords , playing Flute.
lnterference - lt is process or event in which two waves meet to each other, overlap or superimpose each other and
produce a resultant wave.
example - formation of ripples in water , interference in radio waves and producing different sounds , formation of a
soap bubble which seems colorful.
Beats - When sound waves meet each other and both have different frequencies, then they produce a beat.
example - While playing guitar or any other musical instrument, we hear different sounds or different music, lt all
because of production of beats.
- producion of different voices on radio.
(c) Doppler effect - As we know that to listen a sound there is a source and a listener or a observer.
When a source and a observer move to each other or one of them move to other or away from other , there is a
change in pitch of sound or frequency of sound. This whole phenomena causing change in frequency or pitch, is
called doppler effect of doppler shift.
Following cases may happen to produce doppler effect-
(a) souce(S) is at rest and observer (O) move towards source.
(b) souce is at rest and observer move away from source.
(c) observer is at rest and source move towards (O).
(d) observer is at rest and source move away from (O).
(e) both move towars each other.
(d) both move away from each other.
Examples - sounds of car horns , sirens , sound of train's whistle etc.
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