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Vilka [71]
3 years ago
6

The _______ is responsible for determining the frequency of vibration of the air column in the tube within a wind instrument. A.

effective length of the tube B. reed's frequency of vibration C. humidity of the air D. type of reed used
Physics
1 answer:
Vladimir [108]3 years ago
8 0

"A is correct answer." The effective length of the tube is responsible for determining the frequency of vibration of the air column in the tube within a wind instrument. "Hope this helps!" "Have a great day!" "Thank you for posting your question!"

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Answer: V = 15 m/s

Explanation:

As  stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. The observed frequency the car will be experiencing will be addition of the two frequency. That is,

F = 2.1 × 10^10 + 1030 = 2.100000103×10^10Hz

Using doppler effect formula

F = C/ ( C - V) × f

Where

F = observed frequency

f = source frequency

C = speed of light = 3×10^8

V = speed of the car

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2.100000103×10^10 = 3×10^8/(3×10^8 -V) × 2.1×10^10

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Cross multiply

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1.000000049V = 14.71429

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