When a tuning fork of frequency 341 is sounded with another tunin… - Vidyadip

MCQ

When a tuning fork of frequency $341$ is sounded with another tuning fork, six beats per second are heard. When the second tuning fork is loaded with wax and sounded with the first tuning fork, the number of beats is two per second. The natural frequency of the second tuning fork is

A
$334$
B
$339$
C
$343$
✓
$347$

✓

Answer

Correct option: D.

$347$

(d) $n_{-}=$Known frequency $=341 \mathrm{~Hz}, n_s=$ ?$x=6$bps,
which is decreasing (i.e. $x \downarrow$ ) after loading (from 6 to 1 bps)
Unknown tuning fork is loaded so $n \downarrow$
Hence $n-n \downarrow=x \downarrow$ Wrong $n \downarrow-n=x \downarrow \quad \ldots \text { (ii) } $
$\Rightarrow n=n+x=341+6=347 \mathrm{~Hz} $ $\longrightarrow \text { Correct }$

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

When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then

A square loop is carrying a steady current $I$ and the magnitude of its magnetic dipole moment is $m$. If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be

The curve between the work function of a metal $\left(\phi_o\right)$ and its temperature $(T)$ will be

A concave mirror gives an image three times as large as the object placed at a distance of $20 \mathrm{~cm}$ from it. For the image to be real, the focal length should be

A transformer has $100$ turns in the primary coil and carries $8\ A$ current. If input power is one kilowatt, the number of turns required in the secondary coil to have $500 \mathrm{~V}$ output will be

A body of mass $5 kg$ starts from the origin with an initial velocity $\vec{u}=30 \hat{i}+40 \hat{j} m s^{-1}$. If a constant force $\vec{F}=-(\hat{i}+5 \hat{j}) N$ acts on the body, the time in which the $y$-component of the velocity becomes zero is

In the glass capillary tube, the shape of the surface of the liquid depends upon

The quantity that is not conserved in an inelastic collision is

Two springs have their force constant as $k_1$ and $k_2\left(k_1>k_2\right)$. When they are stretched by the same force

Of the diodes shown in the following diagrams, which one is reverse biased