Oscillations, Waves & Sound

A pendulum has a length of 2.5 m. If g=9.8 m/s², what is its period of oscillation?

• 2.50 s

• 3.18 s

• 4.02 s

• 2.05 s

A pendulum of 1.2 m oscillates with a period of 1.75 s. What is the gravitational acceleration?

• 15.47 m/s²

• 9.8 m/s²

• 8.5 m/s²

• 10.0 m/s²

An open tube of 1.5 m resonates at its fundamental frequency. What is the wavelength of the sound if the speed of sound is 343 m/s?

• 1.5 m

• 3.0 m

• 0.75 m

• 2.25 m

A closed tube measures 2 m in length. What is the frequency of its first harmonic if v=343 m/s?

• 42.9 Hz

• 85.8 Hz

• 68.6 Hz

• 171 Hz

A sound wave travels at 340 m/s and has a frequency of 400 Hz. Find its wavelength.

• 0.75 m

• 0.85 m

• 1.2 m

• 0.68 m

A spring with a constant k=12 N/m is compressed 0.25 m. What is its potential energy?

• 0.75 J

• 0.38 J

• 1.25 J

• 0.50 J

A spring is stretched 0.15 m with a constant k=30 N/m. What is the restoring force?

• 3 N

• 4.5 N

• 6 N

• 2 N

A rope under a tension of 100 N has a mass of 0.05 kg and a length of 2 m. What is the speed of the wave?

• 55.5 m/s

• 63.2 m/s

• 70.0 m/s

• 50.0 m/s

A rope of length 1 m and mass 0.02 kg is under a tension of 80 N. What is the frequency of its second harmonic?

• 50 Hz

• 63.25 Hz

• 75.35 Hz

• 125.89 Hz

A car emits a sound of 600 Hz while approaching a stationary observer at 25 m/s. The speed of sound is 340 m/s. What frequency does the observer hear?

• 647.6 Hz

• 600.6 Hz

• 560.6 Hz

• 720.6 Hz