TestUstad

A source of sound of frequency 600 Hz is placed inside water. The speed of sound in water is 1500 m/s and in air, it is 300 m/s. The frequency of sound recorded by an observer who is standing in the air is:

Correct answer: D. 600 Hz

  • A. 200 Hz
  • B. 3000 Hz
  • C. 120 Hz
  • D. 600 Hz

Explanation

Frequency is determined by source oscillation and does not change when waves cross media. Observed frequency remains 600 Hz; only wavelength and speed change according to v = fλ.

Written and checked by , contributorLast updated
Report an error

The more specific you are, the faster it gets fixed. A source beats an opinion.

Prefer email? [email protected]

About Waves

Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.

Practise Waves

1,289 free Waves MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Start a free Waves testAll Waves MCQs

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.

Lecturer Physics Test Physics80 MCQsSubject Specialist Physics Test Physics80 MCQsNET Physics60 MCQsNUMS Physics40 MCQsDUHS Physics36 MCQsETEA MDCAT Physics36 MCQsKMU Physics36 MCQsMDCAT Physics36 MCQsECAT Physics30 MCQsETEA Engineering Admission Test Physics30 MCQsGIKI Physics30 MCQsNED Physics30 MCQsPIEAS Physics30 MCQsPMD Physics25 MCQsBSN Entry Test Physics20 MCQsPAF Airman Physics15 MCQs

More Waves questions

The velocity of sound in air is 332 m/s. Velocity in the vacuum will be:

Two waves of frequency 250 Hz and 255 Hz are sounded together. The beat frequency is:

An accurate and reliable audio oscillator is used to standardize a tuning fork. When the oscillator reading is 514, two beats are heard per second. When the oscillator reading is 510, the beat frequency is 6 Hz. The frequency of the tuning fork is:

The time required for a wave to complete one vibration is called:

The points in a wave separated by the displacement "x" have the phase difference of:

A plane produces a sonic boom when: