Sound & intensity
A 90db is how many times more intense than a 60 db sound?
1000x
A wave in which the particles in the medium move back and forth parallel to the direction of the travel of the wave
longitudinal wave
Description: A child on a swing set swings back and forth with a period of T s and an amplitude of 25 degree(s). Suppose that the motion is
simple harmonic. (a) What is the maximum speed of the child as she swings?
1.8s
(II) An object with mass 2.7 kg is executing simple harmonic motion, attached to a spring with spring constant k = 310 N/m. When the object is 0.020 m from its equilibrium position, it is moving with a speed of 0.55 m/s.
(a) Calculate the amplitude of the motion.
(b) Calculate the maximum speed attained by the object.
A = 0.0551m
Vmax= 0.590 m/s
Person A is standing 10 ft from a loudspeaker. Person B is standing 30 ft from a loudspeaker. How does the sound intensity I_A at person A compare to the sound intensity I_B at person B?
I_A = 9I_B
define a transverse wave
the medium moves in a direction perpendicular to the direction of the wave
A 0.05 kg in SHM is described via x(t) = 0.02 sin (4.52t). What is the effective spring constant?
1.02 N/m
The graph below shows a history graph of the motion of one point on a string as a wave moves by to the right. Circle a correct snapshot graph for the string.
hi lol
A dolphin makes an underwater sound that is measured to have a frequency 20 kHz and a wavelength of 7.5 cm. What is the speed of sound?
1500 m/s
Two sources, A and B, produce in-phase light waves of wavelength 0.5m. At a certain location P in space where the waves meet, wave A has traveled 12.75 m, and wave B has traveled 12.25 m. At Point P, there is...
total constructive interference
A block of mass m is oscillating on a spring with a period of T . If the block is replaced by a block of mass m/3, what happens to the period?
Decreases by a factor of √3
A light wave travels, as a plane wave, from air (n = 1.0) into glass (n = 1.5). Which diagram shows the correct wave fronts?
Hello lol
A 2 meter long string with mass = 4 grams is connected to two cups to create a “cup and string phone”. The cups are pulled apart so that the string is taut, with a tension of 4 Newtons. How long does it take a sound made at one cup to travel across the string and arrive at the other cup?
0.045s
A transverse wave is moving to the left as shown in the diagram. What is the direction of the velocity of point P ? (I don't have premium lol) - Sin(x)
down
A 3 g object is in SHM with spring constant k = 10 N/m and amplitude A = 2 cm. What is the maximum speed the object attains during the oscillation?
1.15 m/s
A red laser produces a beam of light of wavelength 650 nm that is incident upon a double-slit barrier. The light passes through the double slits and appears on a screen some distance away. The angle (in degrees) of the first dark spot is at an angle θ = 0.012 ◦ .
What is the slit separation?
0.16cm
Two loudspeakers are 1.60 m apart. A person stands 3.00 m from one speaker and 3.5 m from the other. What is the lowest frequency at which destructive interference will occur at this point if the speakers are in phase? Assume v = 343 m/s for the speed of sound.
343 HZ
Two light sources are shown as dots in the diagram below.
At the location indicated by the triangle and labeled “x”, what is the path difference?
Is this a location of total destructive or total constructive interference?
1λ , Total constructive
Description: The ultrasonic transducer used in a medical ultrasound imaging device is a very thin disk (m = 0.10 g) driven back and forth in SHMat 1.0 MHz by an electromagnetic coil. (a) The maximum restoring force that can be applied to the disk without... The ultrasonic transducer used in a medical ultrasound imaging device is a very thin disk ( 0.10 ) driven back and forth in SHM at 1.0 by an electromagnetic coil
A) The maximum restoring force that can be applied to the disk without breaking it is 25,000 . What is the maximum oscillation amplitude thatwon't rupture the disk?
B) What is the disk's maximum speed at this amplitude?
a = 6.3m
b = 40m/s
Two narrow slits 60 apart are illuminated with light of wavelength 500 . The light shines on a screen 1.2 distant.
A) What is the angle of the m= 2 bright fringe
B) How far is this fringe from the center of the pattern?
A - 1.7*10^-2
B - 2.0*10^-2