Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

NEET 2020

Exam: NEET
Year: 2020
Subject: Physics
Chapter: Waves and Sound

NEET 2020 · Physics · Waves and Sound

The length of the string of a musical instrument is 90cm and has a...

The length of the string of a musical instrument is

90cm

and has a fundamental frequency of

120Hz

. Where should it be pressed to produce fundamental frequency of

180Hz ?

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

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

Options

A $75cm$
B $60cm$
C $45cm$
D $80cm$

Correct answer

B. $60cm$

Step-by-step solution

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

The fundamental frequency in terms of speed of wave and length between two boundaries, $ν = \dfrac{v}{2l}$ , it means.

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

$\dfrac{{ν}_{1}}{{ν}_{2}} = \dfrac{{l}_{2}}{{l}_{1}}$

$⇒ {l}_{2} = \dfrac{{l}_{1}{ν}_{1}}{{ν}_{2}} = \dfrac{90 \times 120}{180} = 60cm$

Practice Waves and Sound on Quantrex Academy →

More from Waves and Sound

For the given wave equation y = 10 π((x)/(4) + (t)/(2)) , the CORRECT statement is (… MHT CET Medical 2026 The source is emitting sound of frequency 'n'. A source and a listener both are moving… MHT CET Medical 2026 Two uniform strings X and Y made of same material made to vibrate under same tension. If… MHT CET Medical 2026 A simple harmonic progressive wave is represented as Y = 0.04 π (2t - 0.02x) m. At a… MHT CET Medical 2026 Two waves having same amplitude A , angular frequency ω and propagation constant k… MHT CET Medical 2026 Identify the CORRECT statement on beats (A) The amplitude of beats is always constant.… MHT CET Medical 2026 An organ pipe closed at one end produces 5^ th overtone of an air column. It is found… MHT CET Medical 2026 The speed of the transverse wave on the stretched string under tension T_1 is v_1 . If… MHT CET Medical 2026 Full Waves and Sound list All NEET PYQs