# Which is involved when a doppler effect is produced? change in amplitude change in frequency change in wavelength

###### Question:

change in amplitude

change in frequency

change in wavelength

## Answers

Frequency

Explanation: As far as I am aware the doppler effect refers to the change in frequency in relativity from observer towards the source of the sound waves. Hope I helped

change in Frequency

Explanation:

n = 1,732 the amplitude must be increased by a factor of 1,732

Explanation:

The power delivered by a wave is given by

P = E / t

P = ½ μ w² v A²

let's apply this expression to our case the power tripled

3P₀ = ½ μ w² v A’²

let's write the amplitude function of a initial amplitude

A ’= n A₀

where n is a number

3 P₀ = (½ μy w² v A₀²) n²

3P₀ = P₀ n²

n = √ 3

n = 1,732

therefore the amplitude must be increased by a factor of 1,732

Amplitude changes by factor of 2 means double.

Explanation:

Given:

If the power delivered to the string is quadrupled.

From the formula of power transmitted by a sinusoidal wave on a stretched string is,

[tex]P = \frac{1}{2} \mu \omega ^{2} A^{2} v[/tex]

Where [tex]\mu =[/tex] mass per unit length, [tex]\omega =[/tex] angular speed, [tex]A =[/tex] amplitude, [tex]v =[/tex] wave speed, [tex]P =[/tex] power delivered.

Here we need only two terms power and amplitude.

[tex]P[/tex]∝ [tex]A^{2}[/tex]

All other quantities are constant for our problem,

[tex]A = k \sqrt{P}[/tex]

Where [tex]k =[/tex] constant

Here Power become quadruple means four times,

[tex]A = \sqrt{4P}[/tex]

[tex]A = 2\sqrt{P}[/tex]

So amplitude changes by factor of 2 means double

Amplitude is affected by the energy wave in the instrument. High energy wave means high amplitude and low energy wave means low amplitude.

Explanation:

The amplitude of a periodic variable is a measure of its change over a single period. There are various definitions of amplitude, which are all functions of the magnitude of the differences between the variable's extreme values.

The amount of energy carried by a wave is related to the amplitude of the wave. Amplitude of an instrument is directly affected by the wave of the energy in the instruments. High energy wave means high amplitude and low energy wave means low amplitude in the instrument.

A source vibrating at constant frequency generates a sinusoidal wave on a string under constant tension. If the power delivered to the string is doubled, the amplitude changed by b. a factor of 2.

All of the above statement are correct statement.

Explanation

Base-Band amplitude changes are captured as carrier wave wave frequency changes. In order to convert signal amplitude changes to changes in frequency, we need a device like VCO. The bandwidth in the frequency domain increases with the change in carrier frequency.Here, Amplitude mainly describes the intensity of sound we hear, They are directly proportional to each other. In other words, If Amplitude of the sound in greater, then you'll hear loud sound, vice-versa.

Frequency is the pitch of a sound. Change in frequency will change the pitch, and particularly for intensity, it doesn't affect loudness of the sound

Hope this helps!

I believe its C because it must slow down to form the wave.

I think it is b. not sure