Physics Worksheet – Unit 4



Physics Worksheet

Draw and label a sine curve that corresponds to the sound wave depicted below.

What is the formula for Intensity of a Spherical Wave?

What does the P stand for in the formula? What are the units of P?

What does the r stand for in the formula? What are the units of r?

What does 4πr2 represent?

Calculate the intensity of the sound waves from an electric guitar’s amplifier at a distance of 5 m when its power output is equal to each of the following values:

a. 0.25 W

b. 0.50 W

c. 2 W

At a maximum level of loudness, the power output of a 75 piece orchestra radiated as sound is 70 W. What is the intensity of these sound waves to a listener who is sitting 25 m from the orchestra? How about 50 m?

If the intensity of a person’s voice is 4.6 x 10-7 W/m2 at a distance of 2 m, how much sound power does that person generate?

How much power is radiated as sound from a band whose intensity is 1.6 x 10-3 W/m2 at a distance of 15 m?

The power output of a tuba is 0.35 W. At what distance is the sound intensity of the tuba 1.2 x 10-3 W/m2.

When the decibel level of traffic in the street goes from 40 to 60 dB, how much greater is the intensity of noise? (hint: page 490)

If two flutists play their instruments together at the same intensity, is the sound twice as loud? Why or why not? (hint: page 490 Think about Intensity vs. Relative Intensity)

What is Relative Intensity also known or referred to as?

What is the formula for Harmonic Series of Standing Waves on a Vibrating String? How about a Pipe Open at Both Ends? How about a Pipe Closed at One End?

What does the f stand for in the formula What are the units for f?

What does the n stand for in the formula?

What does the v stand for in the formula? What are the units for v?

What does the L stand for in the formula? What are the units for L?

How are the Speed of a Wave (p456) and Harmonic Series of Standing Waves on a Vibrating String (p495) related?

What is the fundamental frequency of a 0.2 m long organ pipe that is closed at one end, when the speed of sound in the pipe is 352 m/s?

A flute is essentially a pipe open at both ends. The length of the flute is 66 cm. What are the first three harmonics of a flute when all keys are closed? The speed of sound in the flute is 340 m/s.

What is the fundamental frequency of a guitar string when the speed of waves on the string is 115 m/s and the effective string lengths are as follows?

a. 70 cm

b. 50 cm

c. 40 cm

A violin string that is 50 cm long has a fundamental frequency of 440 Hz. What is the speed of the waves on this string?

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