Question
If two waves having amplitudes $2A$ and $A$ and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will be
✓
Answer
(a) In the same phase $\phi = 0$
so resultant amplitude = ${a_1} + {a_2} = 2A + A = 3A$
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
The phase of a particle executing simple harmonic motion is $\frac{\pi }{2}$ when it has
→When two bodies collide elastically, then
Colour of shining bright star is an indication of its
Total internal reflection is possible when light rays travel
Oxygen is $16$ times heavier than hydrogen. Equal volumes of hydrogen and oxygen are mixed. The ratio of speed of sound in the mixture to that in hydrogen is
→A current of $6\, A$ enters one corner $P$ of an equilateral triangle $PQR$ having $3$ wires of resistance $2 \,\Omega$ each and leaves by the corner $R$. The currents $i_{1}$ in ampere is ........ .
→When a particle is thrown vertically upwards, its velocity at one third of its maximum height is $10 \sqrt{2}\,m / s$. The maximum height attained by it is .......... $m$
→Regarding speed of sound in gas match the following
→|
$(A)$ Temperature of gas is made $4$ times and pressure $2$ times |
$(P)$ Speed becomes $2\sqrt 2$ times |
|
$(B)$ Only pressure is made $4$ times without change in temperature |
$(Q)$ Speed become $2$ times |
|
$(C)$ Only temperature is changed to $4$ times |
$(R)$ Speed remains unchanged |
|
$(D)$ Molecular mass of the gas is made $4$ times |
$(S)$ Speed becomes half |
A tachometer is a device to measure
Four identical thin rods each of mass $M$ and length $l$, form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is
→