7047

Physics Waves And Oscillations Level: Misc Level

Should a tuning fork be set into oscillation by striking it with or on a hard object?




7046

Physics Waves And Oscillations Level: Misc Level

What is the variable used in studying resonance in an air column in (a) a closed organ pipe of fixed length; (b) a resonance tube apparatuus?




6777

Physics Waves And Oscillations Level: Misc Level

A 2.0-kg block sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (k=200 N/m) which has its other end fixed.If the block has a speed of 4.0 m/s as it passes through the equilibrium position, what is its speed when it is 20 cm from the equilibrium position?

a. 2.6 m/s

b.3.1 m/s

c.3.5 m/s

d.1.9m/s

e.2.3 m/s




6673

Physics Waves And Oscillations Level: Misc Level

On a cold winter day, a car is moving at 20 m/s along a straight road, sounding its 500 Hz horn. You are standing at the side of the road. What frequency do you hear as the car is a) approaching you and b) Receding from you?




6663

Physics Waves And Oscillations Level: Misc Level

Find the sound level in decibels of a sound wave that has an intensity 10x105 W/m^2.




6662

Physics Waves And Oscillations Level: Misc Level

Find the intensity of a sound that has an intensity level of 35.0 dB.




6296

Physics Waves And Oscillations Level: Misc Level

A transverse traveling wave is described by the equation y (x,t)=10 sin (8hx+4 xt), where x and y are in meters, and t in seconds. The wavelength and frequency of the wave 

a.0.25 m and 2 Hz

b.0.25 m and 0.5 Hz

c. 4 m and 0.5 Hz

d.4 m and 2 Hz




6291

Physics Waves And Oscillations Level: Misc Level

A sound level of 0 dB corresponds to an intensity of:

a. 10-6 W/m2

b.0 W/m2

c. 10-8 W/m2

d.10-12 W/m2




6281

Physics Waves And Oscillations Level: Misc Level

A train is approaching a station and blows its horn with a frequency of 200 Hz. If the train has a speed of 25 m/s and the speed of sound is 350 m/s, what is the frequency of sound heard by the people standing on the platform?

a. 186 Hz

b.190 Hz

c.200 Hz

d.215 Hz




6256

Physics Waves And Oscillations Level: Misc Level

A woman with perfect pitch, standing next to a railroad track on still day, hears a whistle of an approaching train and recognises it to be a true concert A (440Hz).After the train passes she notices the pitch has dropped to true F natura 1 (349 Hz).How fast is the rain moving ? What was the actual frequency of the whistle?




6229

Physics Waves And Oscillations Level: Misc Level

A light string with a mass per unit length of 9.00 g/m has its ends tied to two walls separated by a distance equal to three-fourths the length of the string/ An object of mass m is suspended from the center of the string , putting a tension in the string.

(a)Find an expression for the transverse wave speed in the string as a function of the mass of the hanging object.(Answer in terms of the mass m.) m/s




6228

Physics Waves And Oscillations Level: Misc Level

A vacuum cleaner produces sound with a measured sound level of 62.0 dB. 

(a) What is the intensity of this sound in W/m2? pu answer in W/m2

(b) What is the pressure amplitude of the sound? 0.03580 mPa




6227

Physics Waves And Oscillations Level: Misc Level

A plane can fly at Mach 1.38, which means the speed of the plane is 1.38 times the speed of sound in air. What is the angle between the direction of propagation of the shock wave and the direction of the plane,s velocity?




6085

Physics Waves And Oscillations Level: Misc Level

The sound level 12.0 m from a loudspeaker, placed in the open, is 101 dB.What is the acoustic power output of the speaker, assuming it radiates equally in all directions?




6084

Physics Waves And Oscillations Level: Misc Level

A bat at rest sends out ultrasonic sound waves at 44.0 kHz and receives them returned from an object moving directly away from it at 30.0 m/s. What is the received sound frequency?


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