Exam 14: Sound

I stretch a rubber band and "plunk" it to make it vibrate in its fundamental frequency.I then stretch it to four times its length and make it vibrate in the fundamental frequency once again.The rubber band is made so that quadrupling its length quadruples the tension and reduces the mass per unit length by a factor of 4.The new frequency will be related to the old by a factor of

When I stand halfway between two speakers,with one on my left and one on my right,a musical note from the speakers gives me constructive interference.How far to my left should I move to obtain destructive interference?

How far away is a lightning strike if you hear the thunderclap 6.0 s after you see the lightning bolt strike? (v_sound = 340 m/s,v_light = 3.0 × 10⁸ m/s)

An astronaut sets up a pendulum on the Moon,where the acceleration due to gravity is 1/6 that of Earth.If she finds that she must push the pendulum with a frequency of 0.10 Hz to maintain a swinging motion,what is the length of the pendulum?

If the tension on a guitar string is increased by a factor of 3,the fundamental frequency at which it vibrates is changed by what factor?

What is the intensity of sound from a band with a sound level of 129 dB? (I₀ = 10−¹² W/m²)

What is the lowest frequency that will resonate in an organ pipe 5.00 m in length,closed at one end? The speed of sound in air is 340 m/s.

A string of length L with fixed ends is made to go into standing wave patterns.What is the longest wavelength associated with all possible standing wave patterns in this situation?

If the distance between a point sound source and a dB detector is increased by a factor of 8,what will be the reduction in intensity level?

​A common approximation is when the intensity of a sound is doubled,the decibel level increases by 3.The sound level in a particular location is 100 dB.By what approximate factor is the sound intensity increased if the new decibel level of this sound is 106?

If the intensity of a sound is increased by a factor of 100,how is the decibel level changed? The new decibel level will be:

The air in a pipe resonates at 120 Hz and 600 Hz,one of these resonances being the fundamental.If the pipe is open at both ends,how many resonances are between the two given ones,and if the pipe is closed at one end,how many resonances are between the two given ones?

Of the frequencies listed below,to which one is the human ear most sensitive?

The air in a tube open at both ends is sent into its fundamental resonance.One end of the tube is then closed and the air column is again set into its fundamental resonance.The resonant frequency ____ after the end is closed.

The speed of sound at 0°C is 331 m/s.What is the speed of sound at 10.0°C? (0°C = 273 K)

A bat,flying at 7.00 m/s toward a wall,emits a chirp at 50.0 kHz.If the wall reflects this sound pulse,what is the frequency of the echo received by the bat? (v_sound = 340 m/s)