1) An organ pipe is 1.42 m long. What is the first harmonic frequency of this pi

ID: 2123071 • Letter: 1

Question

1) An organ pipe is 1.42 m long.
What is the first harmonic frequency of this pipe when it is open at both ends?

What is the first harmonic frequency of this pipe when it is closed at one end?

2) A speaker generating a tone at 285 Hz is moving towards a stationary observer with a speed of 35 m/s.

Calculate the frequency of the tone perceived by the observer.

Calculate the frequency of the tone perceived by the observer if the speaker is moving away with a speed of 35 m/s.

3) A speaker generating a tone at 347 Hz is stationary.

A person is moving toward the speaker with a speed of 48 m/s.
Calculate the frequency of the tone perceived by the person.

Calculate the frequency of the tone perceived by the person if he is moving away from the speaker with a speed of 48 m/s.

a)first case=v/2*l where v is speed of sound in air

second case v/4*l

b)285*(v/v-35) as frequency increases using doppler effect

c)347*(v+48)/v

in all these answers v is the speed of sound

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