Interference and standing waves
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
A string 1.2 m long vibrates in a standing wave with 3 loops. What is the wavelength, Ari?
A string 2.4 m long vibrates in a standing wave with 3 loops. What is the wavelength, Esme?
In the wave diagram, what is the wavelength, Jun?
- 1.2 m
- 0.4 m
- 0.8 m
In the wave diagram, the same string is made to vibrate with 4 loops instead. What is the new wavelength, Kira?
Use the picture in question 3.
- 0.8 m
- 0.6 m
- 0.3 m
In the wave diagram, how is the standing wave made, Luz?
Use the picture in question 3.
- The string stops moving in places on its own
- Waves reflected from the ends overlap the incoming ones
- One wave travels along and stops
Two dippers make ripples in step in a water tank. A point is the same distance from both. What happens there, Milo?
- No waves arrive
- Destructive interference: calm water
- Constructive interference: big waves
Two speakers play the same note in step, with a wavelength of 0.8 m. A spot is 0.4 m farther from one speaker. What happens there, Noah?
- Constructive interference: louder sound
- The sound changes pitch
- Destructive interference: quieter sound
The same speakers, wavelength 0.8 m: a spot is 0.8 m farther from one speaker. What happens there, Pia?
- Constructive interference: louder sound
- The sound stops completely
- Destructive interference: quieter sound
Noise-cancelling headphones play a sound that matches the outside noise but is shifted half a wave. What does this do, Ren?
- It changes the noise's speed
- It doubles the noise
- It cancels much of the noise
Two sets of ripples cross in a water tank. Why are there lines of calm water, Tala?
- The water there is shallower
- The ripples stop there
- Crests meet troughs there and cancel