The length of the string of a musical instrument is 90 cm and has a fundamental frequency of 120 Hz . Where…

The length of the string of a musical instrument is 90 cm and has a fundamental frequency of 120 Hz. Where should it be pressed to produce fundamental frequency of 180 Hz?
  1. 75 cm from Left
  2. 60 cm from Left
  3. 45 cm from Left
  4. 80 cm from Left

Solution

The fundamental frequency in terms of speed of wave and length between two boundaries, ν=v2l, it means. 

ν1ν2=l2l1

⇒l2=l1ν1ν2=90×120180=60 cm

~

Asked in: NEET 2020 (Phase 2)

Practice more Waves and Sound questions on Aicharya