Question

A bystander hears a siren vary in frequency from 554 Hz to 390 Hz as a...

A bystander hears a siren vary in frequency from 554 Hz to 390 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Use Formula

where is the apparent frequency , is the actual frequency,

is the speed of sound

is the speed of observer

is the speed of truck

-----------------------------

Case 1: Fire truck approaching

(observer is standing still)

----------

-------------(1)

--------------------------------

Case 2: Fire truck moves away

(observer is standing still)

(direction of speed of truck and direction of speed of sound is in opposite direction)

----------

---------------(2)

-----------

From (1) and (2)

ANSWER: Speed of truck =59.65 m/s

===============================

1 0
Know the answer?
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
Similar Questions
A bystander hears a siren vary in frequency from 600 Hz to 394 Hz as a...
A bystander hears a siren vary in frequency from 600 Hz to 394 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)
A bystander hears a siren vary in frequency from 582 Hz to 394 Hz as a...
A bystander hears a siren vary in frequency from 582 Hz to 394 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)
(a) A fire truck with the 500 Hz siren on approaches an observer at 50 m/s,...
(a) A fire truck with the 500 Hz siren on approaches an observer at 50 m/s, who is at rest. What frequency would observer detect? (b) A fire truck with the 500 Hz siren on is at rest. An observer approaches the fire truck with the speed of 50 m/s. What frequency would the observer detect? (The speed of sound is 343 m/s.)
A fire truck emits an 1080 Hz siren. As the truck approaches an observer on the...
A fire truck emits an 1080 Hz siren. As the truck approaches an observer on the sidewalk, he perceives the frequency of the siren to be 1150 Hz. Approximately what frequency does he hear after the truck passes and is moving away? Assume the truck's velocity remains constant, and that the velocity of sound in air is 340 m/s.
Standing at a crosswalk, you hear a frequency of 590 Hz from the siren of an...
Standing at a crosswalk, you hear a frequency of 590 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 497 Hz. Determine the ambulance's speed from these observations. (Take the speed of sound to be 343 m/s.)
A motorcyclist is traveling north on a road at a speed of 29.0 m/s. A fire...
A motorcyclist is traveling north on a road at a speed of 29.0 m/s. A fire truck, traveling south at a speed of 49.0 m/s, approaches with its siren producing sound at a frequency of 2550 Hz. (Enter your answers in Hz. Assume that the speed of sound in air is 343 m/s.) (a) What frequency does the motorcyclist observe as the fire truck approaches? (Enter your answer to the nearest integer.) (b) What frequency does the motorcyclist detect after...
A siren emitting a sound of frequency 1000 Hz moves towards you, and away from a...
A siren emitting a sound of frequency 1000 Hz moves towards you, and away from a cliff at a speed of 25 m/s. a) what is the frequency of sound you heard coming directly to you from the siren? B) what is the frequency of sound you hear reflected from the cliff? (speed of sound = 340 m/s).
A fire engine's siren is 1400 Hz when at rest. Assume that the speed of sound...
A fire engine's siren is 1400 Hz when at rest. Assume that the speed of sound is 343 m/s in air. What frequency do you detect if you move with a speed of 21 m/s toward the fire engine? (Express your answer to two significant figures.) What frequency do you detect if you move with a speed of 21 m/s away from the fire engine? (Express your answer to two significant figures.)
An ambulance has a siren of frequency 880 Hz. You are sitting at a stop light...
An ambulance has a siren of frequency 880 Hz. You are sitting at a stop light as the ambulance passes you, traveling at a constant 22 m/s. If the speed of sound is 343 m/s, what is the change in the frequency that you hear as the ambulance passes you? A.) -56 Hz    B.) -53 Hz     C.) -60 Hz     D.) -116 Hz     E.) -113 Hz
The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk...
The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk listens to this siren as the ambulance passes by at a speed of 65 mph. The speed of sound in air is 330 m/s. a) Calculate the total shift in frequency detected by the pedestrian as the ambulance passes.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT