A person hears a siren as a fire truck approaches and passes by.
The frequency varies...
A person hears a siren as a fire truck approaches and passes by.
The frequency varies from 480Hz on approach to 400Hz going away.
What is the speed of the truck if the speed of sound in air is
343m/s?
Question 1: SOUND
a) A bystander hears a siren vary in frequency from 570 Hz to
398 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.) By how many decibels do you reduce the
sound intensity level due to a source of sound if you triple your
distance from it? Assume that the waves expand spherically....
Hearing the siren of an approaching fire truck, you pull over to
the side of the road and stop. As the truck approaches, you hear a
tone of 470 Hz ; as the truck recedes, you hear a tone of 410 Hz
.
Part A)
How much time will it take for the truck to get from your
position to the fire 6.0 kmkm away, assuming it maintains a
constant speed?
A police siren of frequency is attached to a vibrating platform.
The platform and siren oscillate up and down in simple harmonic
motion with amplitude and frequency . (a) Find the maximum and
minimum sound frequencies that you would hear at a position
directly above the siren. (b) At what point in the motion of the
platform is the maximum frequency heard? The minimum frequency?
Explain.
Can you explain part B in details?thank you
Describe why the sound of an oncoming siren changes as it passes
you on the street. Please include terms such as blue and red shift.
What is one way this is used in astronomy?
The siren of a fire engine that is driving northward at 40.0 m/s
emits a sound of frequency 2180 Hz . A truck in front of this fire
engine is moving northward at 17.0 m/s .What is the frequency of the siren's sound that the fire
engine's driver hears reflected from the back of the truck?What wavelength would this driver measure for these reflected
sound waves?
A police car sounding a siren with a frequency of 1550 Hz is
traveling at 130 km/h .
What frequencies does an observer standing next to the road hear
as the car approaches? As it recedes?
What frequencies are heard in a car traveling at 90.0 km/h in
the opposite direction before and after passing the police car? For
both approaching and receding
The police car passes a car traveling in the same direction at
80.0 km/h. What two frequencies...
In a digit-span task, a person hears a series of items and has
to repeat them back immediately in correct sequence. This task is
often understood to measure the
a.
holding capacity of working memory.
b.
speed with which the person can transfer items from sensory
memory into working memory.
c.
speed with which the person can transfer items from working
memory into long-term storage.
d.
holding capacity of long-term memory.
A person standing 1.00 m from a portable speaker hears its sound
at an intensity of 7.50 × 10−3 W/m2 .
(a) Find the corresponding decibel level.
(b) Find the sound intensity at a distance of 35.0 m, assuming
the sound propagates as a spherical wave.
(c) Find the decibel level at a distance of 35.0 m.
A siren emitting a sound of frequency 1100 Hz moves away from
you toward the face of a cliff at a speed of 15 m/s. Take the speed
of sound in air as 330 m/s.
(a) What is the frequency of the sound you hear coming directly
from the siren? (Give your answer to at least one decimal place.)
Hz
(b) What is the frequency of the sound you hear reflected off
the cliff? (Give your answer to at least...