Question

ii) On the planet Schurr a piloted helicopter is flying toward a stationary spaceship at 25.0 m/s while emitting an audible signal at a frequency of 1200 Hz. The detector at the spaceship receives a tone of 1240 Hz. Determine the speed of sound at the planet Schurr

Answer #1

Doppler Effect:
1. A stationary police officer using a speed “radar detector”
sends a signal with a frequency of 100,000 Hz. The speed of sound
is 340 m/s.
What is the wavelength of the (ultra) sound wave produced by
the detector?
The sound wave reflects off a vehicle moving toward the
officer. How does the frequency of the reflected sound wave (as
recorded by the detector) compare to the original sound wave?
2. The light waves from a distance start...

The siren on an ambulance is emitting a sound whose frequency is
2550 Hz. The speed of sound is 343 m/s. (a) If the ambulance is
stationary and you (the "observer") are sitting in a parked car,
what are the wavelength and the frequency of the sound you hear?
(b) Suppose that the ambulance is moving toward you at a speed of
26.2 m/s. Determine the wavelength and the frequency of the sound
you hear. (c) If the ambulance is...

The siren on an ambulance is emitting a sound whose frequency is
2650 Hz. The speed of sound is 343 m/s. (a) If the
ambulance is stationary and you (the "observer") are sitting in a
parked car, what are the wavelength and the frequency of the sound
you hear? (b) Suppose that the ambulance is moving
toward you at a speed of 26.3 m/s. Determine the wavelength and the
frequency of the sound you hear. (c) If the
ambulance is...

A bat flying toward a wall emits a 39000-Hz sonar pulse. The
pulse is reflected back from the wall and the bat hears the
reflected pulse at a frequency of (39000 + 720) Hz. Take the speed
of sound to be 343 m/s.
Find the speed of the bat, in meters per second.

To measure her speed, a skydiver carries a buzzer emitting a
steady tone at 1 800 Hz. A friend on the ground at the landing site
directly below listens to the amplified sound he receives. Assume
the air is calm and the speed of sound is independent of altitude.
While the skydiver is falling at terminal speed, her friend on the
ground receives waves of frequency 2 260 Hz. (Use 343 m/s as the
speed of sound.)
(a) What is...

To measure her speed, a skydiver carries a buzzer emitting a
steady tone at 1 800 Hz. A friend on the ground at the landing site
directly below listens to the amplified sound he receives. Assume
the air is calm and the speed of sound is independent of altitude.
While the skydiver is falling at terminal speed, her friend on the
ground receives waves of frequency 2 216 Hz. (Use 343 m/s as the
speed of sound.)
(a) What is...

Please show all your work.
A source of sound is located in a room a distance “L” from a
wall. The room temperature is 72°F. AN observer is located between
the source and the wall at 103 cm from the wall. The observer can
hear a loud sound at the 3rd harmonic and the sound
fades at the 4th harmonic.
What is the velocity of sound in the room?
What is the frequency at which the observer can hear the...

The siren on an ambulance is emitting a sound whose frequency is
2450 Hz. The speed of sound is 343 m/s. (a) If the ambulance is
stationary and you (the "observer") are sitting in a parked car,
what are the wavelength and the frequency of the sound you hear?
(b) Suppose that the ambulance is moving toward you at a speed of
26.8 m/s. Determine the wavelength and the frequency of the sound
you hear. (c) If the ambulance is...

1) A car is approaching a reflecting wall. A stationary observer
behind the car hears a sound of frequency 790 Hz from the car horn
and a sound of frequency 873 Hz from the wall.
(a) How fast is the car traveling?
.......... km/h
(b) What is the frequency of the car horn?
........... Hz
(c) What frequency does the car driver hear reflected from the
wall?
............ Hz
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2) A bat flying toward an obstacle at 10 m/s...

When the speed of sound in air is 323 m/s, a drone is flying and
created a 346 Hz sound as it approaches a crossroads in the forest.
a) If the drone is traveling at 19 m/s, what observed frequency
does the stationary beaver hear at the crossroads as the drone is
approaching AND receding? b) What is the observed wavelength of the
sound as the drone is approaching?

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