Practice Problems
Vibrating Strings
Topics:
On this worksheet you will be investigating the interference properties along a
vibrating string
and its
wave velocity
.
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omit
Question 1
If 24 meters of a type of string has a mass of 34.8 grams, what is its linear mass density?
0.835 kg/m
0.00145 kg/m
8.35 kg/m
0.0145 kg/m
omit
Question 2
A section of this string is secured on one side of a sounding board and 31 washers are hung from its other end.
If each washer has a mass of 1.50 grams, what is the tension along the string? Recall that the tension is produced by the weight of the suspended washers: weight (measured in newtons) = mass (measured in kilograms) times gravity (9.8 m/sec
2
).
0.456 newtons
304 newtons
46.5 newtons
0.0147 newtons
omit
Question 3
What will be the speed of any wave that travels along this string?
0.0177 m/sec
5.61 m/sec
0.0234 m/sec
17.7 m/sec
omit
Question 4
The center of the string is now lightly plucked setting the string into vibration. If only one loop is produced along the 44.8-cm long vibrating segment, what is the wavelength of the string's frequency?
Recall that a loop (N-A-N) represents one-half of a wavelength.
1.79 meters
0.224 meters
0.448 meters
0.896 meters
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Question 5
At what frequency is the string resonating?
79.1 hz
39.6 hz
19.8 hz
6.26 hz
omit
Question 6
A second string, having the same length, is now added to the sounding board. It has a linear mass density that is 3 times that of the original string.
When 89 washers are added to this string and it is plucked, at what frequency will this second string resonate?
19.4 hz
6.60 hz
77.4 hz
58.1 hz
omit
Question 7
How many beats would be heard between the two strings over a period of 20 seconds? Recall that one beat is heard each second when the difference in the frequencies between two sources is one hertz.
9.89 hz
9.68 hz
0.430 hz
8.60 hz
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