1. Students in a physics lab are asked to find the length of an air column in a
ID: 2033522 • Letter: 1
Question
1. Students in a physics lab are asked to find the length of an air column in a tube closed at one end that has a fundamental frequency of 254.3 Hz. They hold the tube vertically and fill it with water to the top, then lower the water while a 254.3 Hz tuning fork is rung and listen for the first resonance. What is the air temperature in degrees celsius if the resonance occurs for a water level that is 0.328 m? (Assume that the sound reflects perfectly off of the water.)
2. When poked by a spear, an operatic soprano lets out a 1387 Hz shriek. What is its wavelength if the speed of sound is 348 m/s?
3. What frequency is received by a person watching an oncoming ambulance moving at 116 km/h and emitting a steady 780 Hz sound from its siren? The speed of sound on this day is 347 m/s.
Explanation / Answer
The solution for the question 2 is given as
to find the Wavelength , we have an Equation wavelength= velocity of light/ frequencey so
given data
Frequency =1387Hz
Velocity of sound= 348m/s
so Wavelength=348/1387=0.25m
For question 3
Formula to find the Frequency to wavelength Relation is
F-f=Velocity/ wavelength=347/116=2.99
where F= Final frequency and f= initial frequency
so F-f=2.99=F-780=2.99
Therefore F=782.99(782 Approximately)
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