| ⇦ | 
| ⇨ |
When the wavelength of sound changes from 1 m to 1.01 m, the number of beats heard are 4. The velocity of sound is
Options
(a) 400 m/s
(b) 300 m/s
(c) 404 m/s
(d) 100 m/s
Correct Answer:
404 m/s
Explanation:
v = ʋλ ⇒ Now, v = ʋ × 1
v = 1.01 × ʋ’ Also ʋ’ = (ʋ – 4)
So, ʋ × 1 = 1.01 × (ʋ – 4)
⇒ 1.01ʋ – ʋ = 1.01 × 4
0.01ʋ = 1.01 × 4
⇒ ʋ = 404 Hz
v = ʋλ
= 404 × 1 = 404 m/s
Related Questions: - Three capacitors each of capacitance C and of breakdown voltage V are joined in series
- A cord is wound round the circumference of wheel of radius
- A freely suspended bar magnet aligns itself in
- The maximum kinetic energy of emitted electrons in a photoelectric effect
- The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element Y
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Three capacitors each of capacitance C and of breakdown voltage V are joined in series
- A cord is wound round the circumference of wheel of radius
- A freely suspended bar magnet aligns itself in
- The maximum kinetic energy of emitted electrons in a photoelectric effect
- The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element Y
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply