A wave of frequency 500 Hz travels at 340 m per second. Its wavelength is
Correct answer: A. 0.68 m
- A. 0.68 m
- B. 1.47 m
- C. 170 m
- D. 0.34 m
Explanation
Wavelength is speed divided by frequency, so 340 divided by 500 gives 0.68 m. Multiplying instead of dividing produces the absurdly large 170 m, which a quick sanity check on audible sound would rule out. Middle C at about 262 Hz has a wavelength of roughly 1.3 m, which is a useful reference point.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Wave Speed
Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
Practise Waves
1,281 free Waves MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Wave Speed questions
The relationship between the speed v, frequency f and wavelength of a wave is
The Doppler effect explains why the pitch of an approaching ambulance siren sounds
Which one of the following properties of light does not change with the nature of the medium ?
Doppler effect applies to____________________?
If 20 sound waves pass from a point of a medium in 2 s with the velocity of 20 m/s, then the wavelength is