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The slide whistle is a tube containing a movable piston or plunger that slides w

ID: 1591235 • Letter: T

Question

The slide whistle is a tube containing a movable piston or plunger that slides within the tube’s length. Moving the piston changes the pitch of the tone produced when you blow air into the tube. What statement best summarizes the principle by which a slide whistle operates?

a. The length of a tube has no relationship to the frequencies that will resonate in it.

b. Resonating frequencies are not related to tube length.

c. The length of a tube is related to the frequencies that will resonate in it.

d. Without a movable piston, frequencies cannot resonate in a tube regardless of its length.

Explanation / Answer

In the case of the frequency of the driving force matches with the natural frequency of oscillator, the system oscillates at larger amplitudes. This phenomenon is called resonance.

in the given case, the length of the tube must be match with the frequency that will resonate in it. therefore, the corrct option is c

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