A point source emits sound equally in all direction is a non-abso… - Vidyadip

MCQ

A point source emits sound equally in all direction is a non-absorbing medium. Two points P and Q are at distances of 2m and 3m, respectively, from the source. The ratio of the intensities of the waves at P and Q is …….

A
$3: 2$
B
$4: 9$
C
$2: 3$
✓
$9: 4$

✓

Answer

Correct option: D.

$9: 4$

$9: 4$
Hint :
$I \alpha \frac{1}{r^2} \Rightarrow \frac{ I _{ P }}{ I _{ Q }}=\left(\frac{r_{ Q }}{r_{ P }}\right)^2=\left(\frac{3}{2}\right)^2=\frac{9}{4}$

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→Waves — all question types→Physics STD 11 question papers→Tamilnadu Board STD 11 question papers→Tamilnadu Board question paper generator→

Similar questions

A particle is executing SHM. Then the graph of acceleration as a function of displacement is ……..

A person moving horizontally with velocity $\overrightarrow{ V _m}$. Rain falls vertically with velocity $\overrightarrow{ V _R}$ To save himself from the rain, he should hold an umbrella with vertical at an angle of -

1 calorie is equivalent to

If the angle between force and displacement is obtuse, then the work done is

Twelve forces each of magnitude 10 N acting on a body at an angle of 30° with other forces then their resultant is-

At 0°C, Pressure measured by barometer is 760 mm. What will be the pressure at 100°C?

If two objects of masses m1 and m2 (m1 > m2) are moving with the same momentum then the kinetic energy will be greater for

Two satellites of mass ml and m2(m1> m2) are revolving round the earth in circular orbits of r1 and r2 (r1 > r2) respectively. Which of the following statement is true regarding their speeds v1 and v2 ……..

A sonometer wire is vibrating in the second overtone. In the wire there are ……

The equation of SHM of a particle is $\frac{d^2 y}{d t^2}+k y=0,>$ where $k$ is a positive constant. The time period of motion is given by .......