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horsena [70]
3 years ago
12

Under the Doppler effect, an observer behind a moving wave source observes

Physics
2 answers:
kondaur [170]3 years ago
6 0

Answer: The correct option is C.

Explanation:

Doppler effect is the phenomenon in which there is an apparent change in the frequency or increase or decrease when there is a relative motion between the listener and the observer.

When the listener and the observer are approaching each other then the frequency of the wave will get increased.

When the listener and the observer are moving away from each other then the frequency of the wave will get decreased.

Therefore, under the Doppler effect, an observer behind a moving wave source observes decreased wave frequency.

Likurg_2 [28]3 years ago
5 0
IT should be c a decreased wave frequency.

I don't know man I could be wrong. papa bless

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Explanation:

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One string of a certain musical instrument is 70.0 cm long and has a mass of 8.79 g . It is being played in a room where the spe
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To solve this problem we will apply the concepts of linear mass density, and the expression of the wavelength with which we can find the frequency of the string. With these values it will be possible to find the voltage value. Later we will apply concepts related to harmonic waves in order to find the fundamental frequency.

The linear mass density is given as,

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\mu = \frac{8.79*10^{-3}}{70*10^{-2}}

\mu = 0.01255kg/m

The expression for the wavelength of the standing wave for the second overtone is

\lambda = \frac{2}{3} l

Replacing we have

\lambda = \frac{2}{3} (70*10^{-2})

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f_s = \frac{344}{0.768}

f_s = 448Hz

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The expression that relates the velocity of the wave, tension on the string and linear mass density is

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T= \mu v^2

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PART B) The relation between the fundamental frequency and the n^{th} harmonic frequency is

f_n = nf_1

Overtone is the resonant frequency above the fundamental frequency. The second overtone is the second resonant frequency after the fundamental frequency. Therefore

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Potential energy is highest when the car is released at the top of the ramp. The correct answer is option C

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