Download App

14. waves and sound — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
A man fires a bullet standing between two cliffs. First echo is heard after $3$ seconds and second echo is heard after $ 5$ seconds. If the velocity of sound is $330 m/s$, then the distance between the cliffs is .... $m$
  • A
    $1650$
  • ✓
    $1320$
  • C
    $990$
  • D
    $660 $
✓

Answer

Correct option: B.
$1320$
b
(b) $2({d_1} + {d_2}) = v({t_1} + {t_2})$==>${d_1} + {d_2} = \frac{{330 \times (3 + 5)}}{2} = 1320$ $m$

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→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

If an object is projected vertically upwards with speed, half the escape speed of earth, then the maximum height attained by it is [ $R$ is radius of earth]
→
A body under the action of several forces will have zero acceleration
→
If $\rho $ is the density of the material of a wire and $\sigma  $ is breaking stress, the greatest length of the wire that can hang freely without breaking is
→
Two identical uniform rectangular blocks (with longest side $L$ ) and a solid sphere of radius $R$ are to be balanced at the edge of a heavy table such that the centre of the sphere remains at the maximum possible horizontal distance from the vertical edge of the table without toppling as indicated in the figure. If the mass of each block is $M$ and of the sphere is $M / 2$, then the maximum distance $x$ that can be achieved is
→
Suppose that the force of earth's gravity suddenly disappears, choose the correct answer out of the following statements
→
A glass of ice-cold water left on a table on a hot summer day eventually warms up whereas a cup of hot tea on the same table cools down because:
→
A vertical closed cylinder is separated into two parts by a frictionless piston of mass $m$ and of negligible thickness. The piston is free to move along the length of the cylinder .The length of the cylinder above the piston is $l_1,$ and that below the piston is $l_2,$ such that $l_1 > l_2.$ Each part of the cylinder contains $n$ moles of an ideal gas at equal temperature $T.$ If the piston is stationary, its mass, $m,$ will be given by: ( $R$ is universal gas constant and $g$ is the acceleration due to gravity)
→
A plane sound waves passes from medium $1$ into medium $2$. The speed of sound in medium $1$ is $200\,m/s$ and in medium $2$ is $100 \,m/s$. The ratio of amplitude of the transmitted wave to that of incident wave is :-
→
A block of mass $M$ on a horizontal smooth surface is pulled by a load of mass $M/2$ by means of a rope $AB$ and string $BC$ as shown in the figure. The length & mass of the rope $AB$ are $L$ and $M/2$ respectively. As the block is pulled from $AB = L$ to $AB = 0$ its acceleration changes from $3g$
→
An underwater sonar source operating at a frequency of $60 KHz$ directs its beam towards the surface. If the velocity of sound in air is $330\, m/s,$ the wavelength and frequency of waves in air are:
→