A source 'Y' of unknown frequency produces 4 beats with a source of 240 Hz and 8 beats with a sound of 252 Hz. Frequency of the source 'Y' is:
Correct answer: A. 244 Hz
- A. 244 Hz
- B. 236 Hz
- C. 248 Hz
- D. 246 Hz
Explanation
The beat frequency is the absolute difference between two frequencies. For the source 'Y' to produce 4 beats with 240 Hz, it can be either 240 + 4 = 244 Hz or 240 - 4 = 236 Hz. Similarly, for 8 beats with 252 Hz, it must be 252 - 8 = 244 Hz or 252 + 8 = 260 Hz. The only common frequency is 244 Hz, which satisfies both conditions. Therefore, the correct answer is 244 Hz. Options B (236 Hz), C (248 Hz), and D (246 Hz) do not satisfy both sets of beat frequencies.
Last updated
About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
Practise Waves
1,281 free Waves MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A monochromatic light is incident on two slits and an interference pattern is produced on a screen at distance L. Now one slit is covered, and no light comes from it. What is the change in pattern on the screen?
A tuning fork A produces four beats with another tuning fork B. If the frequency of tuning fork B is 320 Hz, then the frequency of tuning fork A is:
A yellow light of wavelength 500 nm emitted by a single source passes through two narrow slits 1 mm apart. How far apart are two adjacent bright fringes when interference is observed on a screen 10 m away?
All of the following are considered as everyday examples of resonance EXCEPT
appearance of colour in thin films is due to ____________________?