Physics Waves And Oscillations Level: High School
Sound Level Intensity
A person standing a certain distance from an airplane with four equally noisy jet engine is feeling a sound level intensity bordering on pain, 120 dB . what sound level intensity (in dB) would this person experience if the captain shut down three engines ? Do not enter units .a) If the amplitude of a sound wave is doubled , by what factor will the intensity increase ?
b) By how many dB will the intensity level increase ?
Physics Waves And Oscillations Level: High School
Speed of Sound
A fishing boat is drifting just above a school of tuna on a foggy day . Without warming , an engine backfire occurs on another boat 1.02 km away , as seen in the figure at “click here” .a) How much time elapses between the instant when the backfire is heard by the fisherman ?
Physics Waves And Oscillations Level: High School
Interference of Sound
Two adjacent sources of sound each emits a frequency of 700 Hx in air where the speed of sound is 340 m/s How much further back ( in meters) would one of the sources have to be moved so that an observer in front of the sources would bear no sound ? (Hint : Think about the interference of sound moves connecting from the two sources )a) 0.130
b) 0.152
c) 0.177
d) 0.266
e) 0.243
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A pendulum on earth oscillates with a period T . If this pendulum were taken into the moon, where the gravity is about 6 times weaker than on earth, what characteristic of pendulum must change in order for it oscillate with the same period T ?a) The mass of the pendulum bob must be increased
b) The mass of the pendulum bob must be decreased
c) No change is needed
d) The length of the pendulum must be increased
e) The length of the pendulum must be decreased
Physics Waves And Oscillations Level: High School
Intensity of Sound
A sound is measured to have an intensity level of 120 dB when standing a certain distance D from the source . At what distance from the source would you have to stand to hear half this decibel level , ie , 60 dB ?a) 1000 D
b) 2 D
c) 4 D
d) 60 D
e) 100 D
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A block is fastened to a spring whose spring constant is 57.9 N/m . The block and the spring lie on a frictionless , horizontal table . The block is pulled a distance of 99.2 cm from its equilibrium position and released from rest . What is the kinetic energy , in Joules of the block halfway between its equilibrium position and its end point ?a) 21.0
b) 23.8
c) 26.9
d) 30.4
e) 34.3
Physics Waves And Oscillations Level: High School
Projectile Motion and Conservation of Linear Momentum
A 1.00 kg block of wood is sitting at the edge of a table , 1.00 meter above the ground . A 30.0 gram rifle bullet is fired horizontally across the table into the block of wood . where it lodges (ie , the bullet remains in the wood) , knocking it off the table . The block of wood lands 8.00 meters from the edge of the table . How fast was the rifle bullet going when it hit the block of wood ?
Physics Waves And Oscillations Level: High School
You have been captured by space aliens , and placed on board their ship in a windowless room . The spaceship takes off , and sometime later lands on what appears to be solid ground . You would like to know where you are . You have a strong suspicion about your captors , sine Zarkonian National Anthem was reverberating throughout the ship , and you figure it is likely that you have landed on either Zarkon or its moon Abba – although you might also have been brought back to Earth . Fortunately , along with your wristwatch , you have in your pocket a ruler , a 1.00 kg mass , and an ideal (massless) spring to which it can be hooked . (Doesn’t everybody have this kind of stuff in their pocket ? ) Unfortunately , you don’t know the sprig constant . However , you remember some physics , and you attach the mass to the spring and determine that the oscillation period for the mass+spring combination is 0.500 second .a) Is this enough information to figure out which planet/moon you are on ? why and why not ? Since the period is either not enough to figure out where you are , or for additional confirmation , you also determine that when the mass is suspended from the spring and hangs at equilibrium , the spring is stretched about 2.5 cm from its unstrained length .
b) Now you know for sure where you are ! Show how . Are you on Earth , Zarkon , or Abba
Physics Waves And Oscillations Level: High School
Doppler Effect
John is listening to a horn . He knows the frequency of the horn is 300 Hz when both he and the horn are at rest .If he hears a pitch of 270 Hz ,there are clearly several possibilities .a) The distance between the John and the horn is decreasing with time .
b) Both can be moving and have the same speed .
c) Both can be moving but with the different speed .
d) Both can be moving in opposite direction
e) John is moving away from the horn at rest .
Physics Waves And Oscillations Level: High School
Simple Pendulum
The diagram at “Click here “shows a simple pendulum consisting of a mass M suspended by a thin string , The magnitude of the tension is T . The mass swings back and forth between -+ theta 0 .a) The vertical component of tension is constant .
b) T is largest at the bottom (theta = 0)
c) T = Mg at theta = 0
d) T is smallest when theta = -+ theta 0
d) T depends on theta
Physics Waves And Oscillations Level: High School
Speed of Sound
Two pipes are each open only one end . Both pipes have a fundamental frequency of 486 Hz at 25C , but one of the pipes is warmer than the other right now . If the two pipes are sounded together , you hear a beat frequency of 9.60 Hz . What is the temperature of the warmer pipe ?a) 2.51 x 10^1 C
b) 3.64 x 10^1 C
c) 5.28 x 10^1 C
d) 7.65 x 10^1 C
e) 1.11 x 10^2 C
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
If a mass of 700.0 g is hung from the bottom of a vertical spring , the spring will stretch 22.0 cm . The mass is then pulled an additional distance of 13.0 cm from its equilibrium position and released . What is the period of oscillation of this mass / spring system ?a) 5.77 x 10^-1 s
b) 6.52 x 10^-1 s
c) 7.37 x 10^-1 s
d) 8.33 x 10^-1 s
e) 9.41 x 10^-1 s
Physics Waves And Oscillations Level: High School
When you slosh the water back and forth in a tub at just the right frequency , the water alternatively rises and falls at each end , remaining relatively calm at the center . Suppose the frequency to produce such a standing wave in 59.2 cma) 6.67 x 10^-1 m/s
b) 7.54 x 10^-1 m/s
c) 8.52 x 10^-1 m/s
d) 9.63 x 10^-1 m/s
e) 1.09 x 10^-1 m/s
Physics Waves And Oscillations Level: High School
Standing waves
If you have a guitar that is 1 m long and is fixed at both ends, you can pluck it and create a standing wave .Five three possible wavelengths for a standing wave on this string . For each wavelength , state the number of nodes and antinodes the standing wave pattern wave will have . Explain the reasoning , Illustrate .
Physics Waves And Oscillations Level: High School
The figure at “click here” shows a string mass 0.02 kg that’s 25 m long . The wave has a frequency of 3 Hz . Find the amplitude , wavelength , and velocity of the wave and tension on the rope .