Standing Waves Practice
10 problems · instant feedback · full explanations
Standing waves form when a wave reflects and interferes with itself. Boundary conditions pick the allowed wavelengths — that's where harmonics come from.
Q1.
What is a node in a standing wave?
Multiple choice · Easy
Q2.
A 1.2 m string fixed at both ends has wave speed 240 m/s. What is the fundamental frequency?
Numerical answer (Hz) · Medium
Q3.
If the fundamental of a string is 100 Hz, what is the third harmonic?
Numerical answer (Hz) · Medium
Q4.
On a string fixed at both ends, the ends are always:
Multiple choice · Easy
Q5.
An open pipe 0.34 m long resonates with wavelength 0.68 m. If sound speed is 340 m/s, what is the frequency?
Multiple choice · Medium
Q6.
A standing wave on a string has nodes at 0, 20, 40 and 60 cm. What is the wavelength?
Multiple choice · Hard
Q7.
In a standing wave, no net energy flows along the string.
True / False · Easy
Q8.
Antinodes are the points of zero displacement in a standing wave.
True / False · Medium
Q9.
A 1 m string with wave speed 440 m/s vibrates in its second harmonic. What is the frequency?
Numerical answer (Hz) · Hard
Q10.
A singer shattering a wine glass with the right note demonstrates:
Multiple choice · Hard