Download App

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

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
On a windless day, sound emanate isotropically from a point source. Rays of the sound waves emanated from a point source placed close to ground are shown in the figure. Consider horizontal wind towards the left blowing with constant velocity, which is uniform everywhere. In the following figures, rays of sound waves in presence of the wind are shown. Which one is the most correct representation?
  • A

  • B

  • ✓

  • D

✓

Answer

Correct option: C.

c
Velocity of sound depends on velocity of medium as $(v_s)_m = v_s ± v_m$ Here wave front is shifted to left side

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

The efficiency of Carnot engine when source temperature is $T_1$ and sink temperature is $T_2$ will be
→
Two tuning forks of frequency 250 Hz and 256 Hz produce beats. If a maximum is produced just now, after how much time the minimum is produced at the same place:
→
A rod $P$ of length $1\ m$ is hinged at one end $A$ and there is a ring attached to the other end. Another long rod $Q$ is hinged at $B$ and it passes through the ring. The rod $P$ is rotated about an axis which is perpendicular to plane in which both the rods are present and the variation between the angles $\theta$ and $\phi $ are plotted as shown. The distance between the hinges $A$ and  $B$ is ....... $m$.
→
A small block of mass $m$ is projected horizontally with speed $u$ where friction coefficient between block and plane is given by $\mu = cx$, where $x$ is displacement of the block on plane. Find maximum distance covered by the block 
→
Consider the following statements:
  1. An emf can be induced by moving a conductor in a magnetic field.
  2. An emf can be induced by changing the magnetic field.
  1. Both A and B are true.
  2. A is true but B is false.
  3. B is true but A is false.
  4. Both A and B are false.
→
A train has just complicated a $U-$curve in a track which is a semicircle. The engine is at the forward end of the semi circular part of the track while the last carriage is at the rear end of the semicircular track. The driver blows a whistle of frequency $200 Hz.$ Velocity of sound is $340 m/sec$. Then the apparent frequency as observed by a passenger in the middle of a train when the speed of the train is $30 m/sec$ is  ... $Hz$
→
An ideal gas undergoes a cyclic process as shown in diagram. The net work done by the gas in the cycle is
→
Position of an ant ( $\mathrm{S}$ in metres) moving in $\mathrm{Y}-\mathrm{Z}$ plane is given by $S=2 t^2 \hat{j}+5 \hat{k}$ (where $t$ is in second). The magnitude and direction of velocity of the ant at $t=1 \mathrm{~s}$ will be :
→
A slider block $A$ moves downward at a speed of $v_A = 2\ m/s$ , at an angle of $75^o$ with horizontal as shown in the figure. The velocity with respect to $A$ of the portion of belt $B$ between ideal pulleys $C$ and $D$ is $v_{CD/A} = 2\ m/s$ at an angle $\theta $ with the horizontal. The magnitude of velocity of portion $CD$ of the belt when $\theta  = 15^o$ is   .......... $m/s$
→
At constant volume, temperature is increased. Then
→