HSC Science (General) 12th Board ExamMaharashtra State Board
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

Find the Velocity of Sound in the Air and Frequency of the Tuning Fork - HSC Science (General) 12th Board Exam - Physics

Login
Create free account


      Forgot password?

Question

Wavelengths of two notes in the air are`[70/153]^m` and `[70/157]^m`. Each of  these notes produces 8 beats per second with a tuning fork of fixed frequency. Find the velocity of sound in the air and frequency of the tuning fork.

Solution

Let the wavelength of the tuning fork be L

∴ f = c/L

given,

c/(70/157) - c/L = 8

∴ 157c/70 - c/L = 8 ... (1)

and,

c/L - c/(70/153) = 8

∴ c/L - 153c/70 = 8 ... (2)

adding 1 and 2

(157c - 153c)/70 = 16

∴ 4c = 1120

∴ c = 280 m/s

as f = c/L

∴ f = 280/L

substituting in (1)

157 × 280/70 - f = 8

f = 628 - 8

∴ f = 620Hz

  Is there an error in this question or solution?

APPEARS IN

 2013-2014 (October) (with solutions)
Question 1.4 | 3.00 marks

Video TutorialsVIEW ALL [1]

Solution Find the Velocity of Sound in the Air and Frequency of the Tuning Fork Concept: Beats.
S
View in app×