Download App

Waves and Sound — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWaves and Sound1 Mark
MCQ
A tuning fork whose frequency as given by manufacturer is $512 \mathrm{~Hz}$ is being tested with an accurate oscillator. lt is found that the fork produces a beat of $2 \mathrm{~Hz}$ when oscillator reads $514 \mathrm{~Hz}$ but produces a beat of $6 \mathrm{~Hz}$ when oscillator reads $510 \mathrm{~Hz}$. The actual frequency of fork is
  • A
    $508 \mathrm{~Hz}$
  • B
    $512 \mathrm{~Hz}$
  • ✓
    $516 \mathrm{~Hz}$
  • D
    $518 \mathrm{~Hz}$
✓

Answer

Correct option: C.
$516 \mathrm{~Hz}$
(c) The tuning fork whose frequency is being tested produces $2$ beats with oscillator at $514 \mathrm{~Hz}$, therefore, frequency of tuning fork may either be $512$ or $516.$ Withoscillator frequency $510$ it gives $6$ beats $/ \mathrm{sec}$, therefore frequency of tuning fork may be either $516$ or $504.$ Therefore, the actual frequency is $516 \mathrm{~Hz}$ which gives $2$ beats/sec with $514 \mathrm{~Hz}$ and 6 beats/sec with $510 \mathrm{~Hz}$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Waves and Sound→Waves and Sound — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The radius of curvature for a convex lens is $40 \mathrm{~cm}$, for each surface. Its refractive index is $1.5$ The focal length will be
→
A Carnot engine whose low temperature reservoir is at $7^{\circ} \mathrm{C}$ has an efficiency of $50 \%$. It is desired to increase the efficiency to $70 \%$. By how many degrees should the temperature of the high temperature reservoir be increased
→
The transverse nature of light is shown by [CPMT 1972, 74, 78;
→
If the tension and diameter of a sonometer wire of fundamental frequency $n$ are doubled and density is halved then its fundamental frequency will become
→
To convert a $800\, mV$ range milli voltmeter of resistance $40 \,\Omega$ into a galvanometer of $100\, mA$ range, the resistance to be connected as shunt is .............. $\Omega $
→
A galvanometer of resistance, $G,$ is shunted by a resistance $S$ $ohm$. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is
→
An astronomical telescope has an angular magnification of magnitude $5$ for distant objects. The separation between the objective and the eye piece is $36 \mathrm{~cm}$ and the final image is formed at infinity. The focal length $f$ of the objective and the focal length $f$ of the eye piece are
→
The current in a coil changes from 4 ampere to zero in $0.1 \mathrm{~s}$. If the average e.m.f. induced is $100 \mathrm{volt}$, what is the self inductance of the coil
→
A body cools in $7$ minutes from $60^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ What time (in minutes) does it take to cool from $40^{\circ} \mathrm{C}$ to $28^{\circ} \mathrm{C}$ if the surrounding temperature is $10^{\circ} \mathrm{C}$ ? Assume Newton's Law of cooling holds
→
If a ladder weighing $250\ N$ is placed against a smooth vertical wall having coefficient of friction between it and floor is $0.3$ , then what is the maximum force of friction available at the point of contact between the ladder and the floor
→