HomeworkLib
Question

The siren of an ambulance emits a predominant frequency of 1650 Hz. When the air temperature...

The siren of an ambulance emits a predominant frequency of 1650 Hz. When the air temperature is 12 °C, and the ambulance moves away from you at 16 m/s, will the frequency of the siren seem to you to be lower, higher, or the same as its actual frequency? [You are motionless.]

A) lower

B) higher

C) the same

science   physics   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

The siren of ambulance acts as a source of sound.As we know that according to Doppler effect when a source of sound moves away from the observer then the apparent frequency of sound as heard by observer seems to be lower than original frequency of sound.

The equation for apparent frequency is-

where v=velocity of sound

Vs=velocity of source(here it is velocity of ambulance)

f=original frequency of source

Since

so

So we conclude that apparent frequency of sound seems to be lower.

So option(A) is correct.

0 0
Add a comment
Know the answer?
Add Answer to:
The siren of an ambulance emits a predominant frequency of 1650 Hz. When the air temperature...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • The siren of a fire truck at rest emits at a predominant frequency of 1950 Hz....

    The siren of a fire truck at rest emits at a predominant frequency of 1950 Hz. What frequency will you hear if you are at rest and the fire truck car moves at 20.5 m/s (a) toward you? The temperature of that day is 20°C so use Vsound 343 m/s. Please submit your answer with the correct number of significant figures and the corresponding units

  • A stationary ambulance has stopped at an intersection. The ambulance's siren emits a 628-Hz sound but...

    A stationary ambulance has stopped at an intersection. The ambulance's siren emits a 628-Hz sound but the driver of a car moving away from the ambulance hears a 595-Hz sound. What is the speed of the car? More than 16 m/s. Between 10 m/s and 12 m/s. Between 12 m/s and 14 m/s. Less than 8 m/s. Between 14 m/s and 16 m/s.

  • The predominant frequency of a certain fire truck's siren is 1450 Hz when at rest. Take...

    The predominant frequency of a certain fire truck's siren is 1450 Hz when at rest. Take the speed of sound in air to be 343 m/s . What frequency do you detect if you move with a speed of 38.0 m/s toward the fire truck? What frequency do you detect if you move with a speed of 38.0 m/s away from the fire truck?

  • A woman is sitting at a bus stop when an ambulance with a siren wailing at...

    A woman is sitting at a bus stop when an ambulance with a siren wailing at 316 Hz approaches at 63 miles per hour (mph). Assume the speed of sound to be 343 m/s. a) How fast is the ambulance moving in meters per second? (perform the necessary unit conversion) vs= 63 mph = b) What frequency does the woman hear? fa = _______ Hz c) What speed (vs) would the ambulance be traveling in order for the woman to...

  • The siren of a police car at rest emits at frequency of 1600 Hz. What frequency...

    The siren of a police car at rest emits at frequency of 1600 Hz. What frequency will you hear if you are at rest and the police car moves at 25 m/s toward you. Assume T air= 20 degrees C, v=343 m/s ANS: f'=1725.8

  • 3. An ambulance is moving with a certain speed v and sounding its siren with a...

    3. An ambulance is moving with a certain speed v and sounding its siren with a frequency f. A stationary observer hears a frequency of 372 Hz as the ambulance approaches him and a frequency of 338 Hz as the ambulance moves away from him. If the temperature of air is 30°C, what is the speed of the ambulance?

  • An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 380Hz. Each...

    An ambulance is traveling East at 20m/s. The siren emits a fixed frequency of 380Hz. Each of the following cars is traveling down the road as described. Determine if the driver of the car will hear a frequency the same as 380Hz, higher than 380Hz, or lower than 380Hz. I really suggest drawing a picture to help sort this out. a) A car driving East at a speed of 20m/s. The car is in front of the ambulance. b) A...

  • An ambulance travels east down a highway at a speed of 33.5 m/s, and its siren...

    An ambulance travels east down a highway at a speed of 33.5 m/s, and its siren emits a sound frequency at a frequency of 400 Hz. What frequency is heard by a person in a car traveling west at 24.6 m/s: a) as the car approaches the ambulance ? b) as the car moves away from the ambulance ? (Take the speed of sound to be 343 m/s) PLEASE INCLUDE WRITTEN EXPLANATION

  • The predominant frequency of a certain fire truck's siren is 1690 Hz when at rest. Part...

    The predominant frequency of a certain fire truck's siren is 1690 Hz when at rest. Part A What frequency do you detect if you move with a speed of 32.5 m/s toward the fire truck? f = Part B What frequency do you detect if you move with a speed of 32.5 m/s away from the fire truck? f =

  • An ambulance that moves at 45.00 m / s sounds its siren, whose frequency is 520.00...

    An ambulance that moves at 45.00 m / s sounds its siren, whose frequency is 520.00 Hz. A car moves in the same direction as the ambulance at 20.00 m / s. How often does a person hear in the car when the ambulance approaches the car, and (b) after the ambulance goes to the car?

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT