An Open e-Library for Engineering Entrance Exams in India.
BEAT FREQUENCY
  • :arrow: Pls help me with this

    If three tuning forks of frequencies 401Hz, 402Hz, 403Hz are vibrated simultaneously then what will be the beat frequency heard?
  • 2 Comments sorted by
  • For superposition of waves of frequencies 401and 402 it is 1 s.
    For superposition of waves of frequencies 402 and 403 it is 1 s, and
    For superposition of waves of frequencies 401 and 403 it is 0.5 s.

    0.5 s after a minimum due to all three, first two combinations gives maximum intensity and hence the next minimum intensity will occur only after 1 s and hence the beat period is 1s and beat frequency will be 1 Hz.

    (Draw the time intensity graph for all three combinations separately that will make the things clear)


    Note: PLEASE DONT POST SAME QUESTION IN 2 DIFFERENT CATEGORIES.
  • savy_2020 said:

    :arrow: Pls help me with this

    If three tuning forks of frequencies 401Hz, 402Hz, 403Hz are vibrated simultaneously then what will be the beat frequency heard?




    Since the first two forks differ by one Hz The second two do also. Each pair (401 and 402 plus 402 and 403), will generate a 1 hz beat. The difference in frequency between first and third (401 and 403), is 2 Hz., They will generate a 2 Hz. beat. But since the 1 beat per second fits neatly in the 2 beat per second , you will just hear 2 beats per second. 

Howdy, Stranger!

It looks like you're new here. If you want to ask questions, login using your Google or Facebok IDs!

Login with Facebook Sign In with Google Sign In with OpenID Sign In with Twitter

In this Discussion

This is a beta version of the new KnowledgeBin.org. Please provide your feedback here: http://bit.ly/knowledgebin

Share Me

  • Please share this topic with your friends. Click any of the icons below:
  • stumbleupon
  • Twitter
  • facebook
  • myspace
  • technorati
  • reddit
  • fark
  • email

Top Posters