Question

A sound is produced under water then propagate to the surface
of the water, and some of the sound is transmitted to the air. The
speed of sound in water is 1450 m/s, the speed of sound in air is
330m/s. As the sound passes from water to air, the effect of the
frequency f and the wavelength lambda is:

A. f and lambda remain unchanged

B. f unchanged but lambda increases

C. f unchanged but lambda decreases

D. f increases but lambda decreases

E. f decreases but lambda increases

Answer #1

A sound wave of frequency f=300Hz produced by a moving source
40m/s is observed by a stationary observer. The speed of sound in
ambient air is 345 m/s.
As the source moves toward the observer, how far does the
source travel between subsequent wave pulses?
What is the apparent wavelength of the sound wave as perceived
by the observer?
What is the frequency of sound perceived by the observer?
Note, when the source is in motion, the speed of the...

The frequency will sound different if we hear a sound source
moving relative to us. This phenomenon is called the Doppler Effect
in Physics. An ambulance sounds a siren at 1515 Hz and passes a
cyclist moving at 2.12 m / s. After the ambulance passed, the
cyclist heard a siren sound at a frequency of 1501 Hz. The speed of
sound in the air is about 343 m / s.
What is the speed (speed) of the ambulance in...

A sound source A with a speed of 29.9 m/s and a reflecting
surface B with a speed of 65.8 m/s moves directly towards each
other. The source emits a wave frequency of 1.20 x 103 Hz, take the
speed of sound in air to be 329 m/s. What is (a) the frequency as
perceived by the reflector as the two sources moves towards each
other; (b) The frequency as perceived by source A, when the sound
wave reflected back...

QUESTION 1 (SOUND) :
a) A person holds a rifle horizontally and fires at a target.
The bullet has a muzzle speed of 170 m/s, and the person hears the
bullet strike the target 1.10 s after firing it. The air
temperature is 73°F. What is the distance to the target?
b) Sound propagating through air at 29 °C passes through a
vertical cold front into air that is 3.8 °C. If the sound has a
frequency of 2500 Hz,...

1. Parallel light rays in air strike the surface of glass (n =
1.5) at an angle of incidence of 26o. Some of the rays
are reflected and some are refracted. What is the angle between
reflected and refracted rays?
2. A green laser (wavelength 545 nm) is shone from air to water.
Which of the following statements is true for the wavelength and
frequency of the laser light?
A. The wavelength will decrease but the frequency will remain
the...

1. A flask containing 800 g. of water is heated. If the
temperature of the water increases from 20 degrees Celsius to 85
degrees Celsius, how much heat (in joules) did the water
absorb?
2. How much heat, in joules, and in calories, must be added to a
75 g. iron block with a specific heat of 0.451 J/g degree Celsius
to increase its temperature from 25 degrees Celsius to its melting
temperature of 1535 degrees Celsius?
3. Consider sound...

A. What length should an oboe have to produce a fundamental
frequency of 244 Hz on a day when the speed of sound is 343 m/s? It
is open at both ends.
B. What frequency is received by a person watching an oncoming
ambulance moving at 119 km/h and emitting a steady 706 Hz sound
from its siren? The speed of sound on this day is 333 m/s.
C. What energy in millijoules falls on a 0.808 cm diameter
eardrum...

You are in a boat traveling perpendicular to waves in water. The
wave speed is 8.20 m/s, your speed is 6.80 m/s, and you are heading
into the waves. If the wavelength of the waves is 8.20 m, how much
time passes between hitting the top of one wave and the next? [This
Doppler effect in water is just like that in sound; you can also
calculate it from velocities and length.] __________ s

*I NEED ALL THE QUESTIONS ANSWERS*
1.When the period of oscillation decreases, the (a) amplitude
increases, (b) frequency increases, (c)
wavelength increases, (d) frequency decreases.
2.Sound is (a) transverse wave, (b) longitudinal wave, (c)
standing wave, (d) magnetic wave.
3.When two waves interfere, which of the following add? (a)
wavelength, (b) frequency, (c) phase, (d) amplitude.
4.The wave speed is equal to (a) the ratio of the frequency and
wavelength, (b) the ratio of the frequency and the period, (c)...

In the “Resonance” lab, you used a “piano” to generate a
frequency of 261.63 Hz to explore the different resonance lengths.
With it you found the first resonance close to 33 cm. Where would
you expect to find the next resonance?
A.66cm
B. 99 cm
C. 49.5 cm
D. 132 cm
please show work
in the “Resonance” lab, you used a “piano” to generate a
frequency of 261.63 Hz to explore the different resonance lengths.
With it you found the...

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