When two tuning forks (fork 1 and fork 2) are sounded simultaneou… - Vidyadip

MCQ

When two tuning forks (fork $1$ and fork $2$) are sounded simultaneously, $4$ beats per second are heard. Now, some tape is attached on the prong of the fork $2$. When the tuning forks are sounded again, $6$ beats per second are heard. If the frequency of fork $1$ is $200\, Hz$, then what was the original frequency of fork $2$? .... $Hz$

A
$202$
B
$200$
C
$204$
✓
$196$

✓

Answer

Correct option: D.

$196$

d
Frequency of fork $1=200 \mathrm{Hz}=\mathrm{n}_{0}$

No. of beats heard when fork $2$ is sounded

with fork $1=\Delta n=4$

Now we know that if on loading (attaching tape) an unknown fork, the beat frequency increases (from $4$ to $6$ in this case ) then the frequency of the unknown fork $2$ is given by, $\mathrm{n}=\mathrm{n}_{0}-\Delta \mathrm{n}=200-4=196 \mathrm{Hz}$

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 "M.C.Q (1 Marks)" from 14. waves and sound→14. waves and sound — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Two racing cars of masses ${m_1}$ and ${m_2}$ are moving in circles of radii ${r_1}$ and ${r_2}$ respectively. Their speeds are such that each makes a complete circle in the same duration of time $t$. The ratio of the angular speed of the first to the second car is

A particle of mass $m$ is acted upon by a force $F$ given by the empirical law $F = \frac{R}{{{t^2}}}\,v(t)$. If this law is to be tested experimentally by observing the motion starting from rest, the best way is to plot

A space craft of mass $'M' $ and moving with velocity $ 'v' $ suddenly breaks in two pieces of same mass $m$. After the explosion one of the mass $ 'm'$ becomes stationary. What is the velocity of the other part of craft

The ratio of specific heat of a mixture of one mole of helium and one mole of hydrogen gas will be

What is the formula to find escape velocity?

The ratio of maximum and minimum magnitudes of the resultant of two vector $\vec a$ and $\vec b$ is $3 : 1$. Now $| \vec a |$ is equal to

At nodes in stationary waves

Two mole of oxygen is mixed with eight mole of helium. The effective specific heat of the mixture at constant volume is:

Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of $0.4 \,m/s$. It collides head on with the second elastically, the second one similarly with the third and so on. The velocity of the last ball is .......... $m/s$

The specific heat of a gas at constant volume is $21.2\, J/mole/°C.$ If the temperature is increased by $1°C$ keeping the volume constant, the change in its internal energy will be ...... $J$