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Andrei [34K]
3 years ago
12

The siren on an ambulance is emitting a sound whose frequency is 2450 Hz. The speed of sound is 343 m/s. If the ambulance is sta

tionary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear?
Physics
2 answers:
lyudmila [28]3 years ago
5 0

Answer:

The wavelength is 0.14 m

Explanation:

Given that,

Frequency = 2450 Hz

Speed of sound = 343 m/s

We need to calculate the wavelength

Using formula of wavelength

v=  f\lambda

Where, v = speed of sound

f = frequency

Put the value into the formula

\lambda=\dfrac{v}{f}

\lambda=\dfrac{343}{2450}

\lambda=0.14\ m

Hence,  The wavelength is 0.14 m

Anna11 [10]3 years ago
5 0

Explanation:

It is given that,

Frequency of the siren, f = 2450 Hz

The speed of sound, v = 343 m/s

Here, both ambulance and the observer is stationary. The observed frequency is calculated using Doppler's effect as :

f'=\dfrac{v+v_o}{v-v_s}\times f

v_o is the velocity of observer

v_s is the velocity of source

v is the speed of sound wave

Here, v_o=v_s=0

So, f' = f

f' = 2450 Hz

Wavelength, \lambda'=\dfrac{v}{f'}

\lambda'=\dfrac{343\ m/s}{2450\ Hz}

\lambda'=0.14\ m

So, the frequency and wavelength of the observed sound is 2450 Hz and 0.14 meters. Hence, this is the required solution.

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Answer:

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Explanation:

The wavelength of the monochromatic light can be found using young's double slits formula,

y = Dλ/d  

y/λ = D/d

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y is the distance between bright fringes.

d is the double slit separation distance

D is the distance from the slits to the screen

For the red laser,

yr/λr = D/d

For the laser pointer,

yp/λp = D/d

Equating both equations yields,

yr/λr = yp/λp

Re-arrange for λp

λp = yp*λr/yr

λp =  (5*632.8)/5.14

λp = 615.56 nm

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