A tuning fork is sounded above a resonating tube (one end closed), which resonates at a length of 0.40 m and again at 1.2 m. If the tube length were extended further, at what point will the tuning fork again create a resonance condition?
a. 1.6 m
b. 2.0 m
c. 2.4 m
d. 3.2 m
e. 6.4 m
[Ques. 2] Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. As long as the current in the primary is steady at 3.0 A, the current in the secondary will be
a. 3.0 A.
b. 6.0 A.
c. 1.5 A.
d. zero.
[Ques. 3] When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.)
a. It is open at both ends.
b. It is closed at both ends.
c. It is open at one end and closed at the other end.
d. Any of the above could be true.
[Ques. 4] By what factor is the self-inductance of an air solenoid changed if its length and number of coil turns are both multiplied by seven?
a. 1/7
b. 7
c. 1
d. 49
e. 1/49
[Ques. 5] 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. 17.0 Hz
b. 34.0 Hz
c. 68.0 Hz
d. 1 700 Hz
e. 3 400 Hz
[Ques. 6] By what factor is the self-inductance of an air solenoid changed if only its number of coil turns, N, is multiplied by five?
a. 1/5
b. 5
c. 15
d. 25
e. 1/25
[Ques. 7] A 2.5-m-long organ pipe is open at one end and closed at the other. Its fundamental tone has wavelength
a. 1.3 m.
b. 5.0 m.
c. 10 m.
d. 16 m.
e. 2.5 m.
[Ques. 8] What is the self-inductance in a coil that experiences a 2.30-V induced emf when the current is changing at a rate of 160 A/s?
a. 6.96E1 H
b. 3.31E2 H
c. 160 H
d. 1.44E2 H
e. 3.68E+1 H
[Ques. 9] A pipe is open at both ends. The distance from a node to its adjacent antinode is equal to _______.
a. 0.25
b. 0.5
c. 1.25
d. 1.5
[Ques. 10] A coil with a self-inductance of 0.90 mH experiences a constant current buildup from zero to 15 A in 0.65 s. What is the induced emf during this interval?
a. 8.78E3 V
b. 2.08E2 V
c. 8.78E+2 V
d. 2.56E2 V
e. 2.31E2 V
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