Doubtclip is an AI tutor that turns any homework or exam doubt into a step-by-step whiteboard video lesson with diagrams, formulas, and voice explanation.

Which subjects and exams does it support?

It supports Physics, Chemistry, Mathematics/Calculus and related STEM doubts for school boards, JEE, NEET, and global high-school / undergrad practice.

How do I get a video solution?

Upload a photo of the question or paste the text, sign in, and Doubtclip generates a whiteboard-style explanation video you can watch and share.

Is Doubtclip available worldwide?

Yes. Doubtclip is a web app for students globally. Lessons are available in English and Hinglish.

Waves

JEE Main level, single correct, medium

120 of 142

Question 120 of 142

A tuning fork $A$ of unknown frequency produces $5beats{s}^{-1}$ with a fork of known frequency $340Hz$ . When fork $A$ is filed, the beat frequency decreases to $2beats{s}^{-1}$ . What is the frequency of fork $A$ ?

Show answer and solution

Answer: (A) $335Hz$

Initially beat frequency

=5Hz

so,

{\rho }_{A}=340\pm 5=345Hz,

335Hz

after filing frequency increases slightly so, new value of frequency of

A\gt {\rho }_{A}

Now, beat frequency

=2Hz

\Rightarrow

new

{\rho }_{A}=340\pm 2=342Hz,

338Hz

hence, original frequency of

A

{\rho }_{A}=335Hz

JEE Main question paper PDF

Open a shift to read the full paper on this page, or download it.

JEE Main 2025 Apr 2 Shift 1 question paper

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.

See it move: Standing waves on a string simulationDrag the sliders and watch the numbers in this question change.

More Physics practice

JEE Main Physics practice question on Waves (Beats), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

A tuning fork AAA of unknown frequency produces 5beatss−15beats{s}^{-1}5beatss−1 with a fork of known frequency 340Hz340Hz340Hz. When fork AAA is filed, the beat frequency decreases to 2beatss−12beats{s}^{-1}2beatss−1. What is the frequency of fork AAA ?

JEE Main question paper PDF

More Physics practice

A tuning fork $A$ of unknown frequency produces $5beats{s}^{-1}$ with a fork of known frequency $340Hz$ . When fork $A$ is filed, the beat frequency decreases to $2beats{s}^{-1}$ . What is the frequency of fork $A$ ?