MCQ
Two sound waves of intensity $2 \,W / m ^2$ and $3 \,W / m ^2$ meet at a point to produce a resultant intensity $5 \,W / m ^2$. The phase difference between two waves is ......
- A$\pi$
- B$\frac{\pi}{4}$
- ✓$\frac{\pi}{2}$
- D$0$
✓
Answer
Correct option: C.
$\frac{\pi}{2}$
c
(c)
(c)
$I=I_1+I_2+2 \sqrt{T_1} \sqrt{T_2} \cos \phi$
$5=3+2+2 \sqrt{6} \cos \phi$
$\therefore \cos \phi=0$
$\text { or } \phi=\frac{\pi}{2}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Work done in splitting a drop of water of $1 \,mm $ radius into $10^6$ droplets is (Surface tension of water $ = 72 \times {10^{ - 3}}J/{m^2})$
→A wedge of height $H$ (fixed) and inclination $\alpha $ (variable) is moving on a smooth horizontal surface with constant acceleration $g\ m/s^2$ . A small block is placed at bottom of incline as shown in figure, slips on the smooth surface of incline . Choose $CORRECT$ statement about time taken by block to reach the top of incline
→$\text{ABCDEFGH}$ is a hollow cube made of an insulator $($figure$)$ face $\text{ABCD}$ has positive charge on it. Inside the cube, we have ionised hydrogen. The usual kinetic theory expression for pressure.
→If a solid sphere of mass $5\,kg$ and a disc of mass $4\,kg$ have the same radius. Then the ratio of moment of inertia of the disc about a tangent in its plane to the moment of inertia of the sphere about its tangent will be $\frac{x}{7}$. The value of $x$ is $.........$
→A body of mass $m= 10^{-2}$ $kg$ is moving in a medium and experiences a frictional force $F= -kv^2$. Its initial speed is $v_0= 10$ $ms^{-1}$. If, after $10\; s$, its energy is $\frac{1}{8}$ $mv_0^2$ the value of $k$ will be
→A closed organ pipe of radius $r_1$ and an open organ pipe of radius $r_2$ and having same length $'L'$ resonate when excited with a given tunning fork. Closed organ pipe resonates in its fundamental mode where as open organ pipe resonates in its first overtone, then
→The fundamental frequency of a string stretched with a weight of $4 kg$ is $256 Hz$. The weight required to produce its octave is .... $kg \,wt$
→A body is rotating uniformly about a vertical axis fixed in an inertial frame. The resultant force on a particle of the body not on the axis is:
Which of the following equations does not represent a simple harmonic motion?
Two identical spheres move in opposite directions with speeds $v_1$ and $v_2$ and pass behind an opaque screen, where they may either cross without touching (Event $1$) or make an elastic head-on collision (Event $2$)
→