

InterviewSolution
Saved Bookmarks
1. |
Solved Problems1. The wavelength of two notes in air are 83 m and 83 m. Each of these notes172170produces 4 beats per second with a third note of a fixed frequency. Find the speed ofsound in air. |
Answer» Let the third note be having L as wavelength Hence the frequency = c/L Given c / (85/172) - c/L = 4-------------(1) And c/L - c/(85/170) = 4 Adding c (2/85) = 8 So c = 340 m/s Hence the third note would have a frequency 340/L From (1) 340*172 / 85 - 340/L = 4 So 340/L = 684 Hz Frequency of third note is 684 Hz and velocity of sound is 340 m/s.. |
|