MCQ
Coherent sources are characterized by the same
- APhase and phase velocity
- BWavelength, amplitude and phase velocity
- CWavelength, amplitude and frequency
- ✓Both $(b)$ and $(c)$
✓
Answer
Correct option: D.
Both $(b)$ and $(c)$
d
(d) Because in general phase velocity = wave velocity. But in case of complex waves (many waves together) phase velocity $ \ne $ wave velocity.
$\therefore $ If two waves have same $\lambda ,v;$ then they have same frequency too
(d) Because in general phase velocity = wave velocity. But in case of complex waves (many waves together) phase velocity $ \ne $ wave velocity.
$\therefore $ If two waves have same $\lambda ,v;$ then they have same frequency too
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 value of contact angle for kerosene with solid surface ........ $^o$
→The $\text{r.m.s}$ velocity of oxygen molecules at $27^\circ C$ is $318\ m/ s.$ the $\text{r.m.s}$ velocity of hydrogen molecules at $127^\circ C$ is:
→Carnot heat engine works with an ideal diatomic gas and an adiabatic volume expansion ratio $32$ . Then its efficiency is ....... $\%$
→How many wavelength of $Kr^{86}$ are there in $1m?$
→Which of the following expression does not represent simple harmonic motion?
Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rodmass system (see figure). Because of torsional constant $k$, the restoring torque is $\tau = k\,\theta $ for angular displacement $\theta $. If the rod is rotated by $\theta _0$ and released, the tension in it when it passes through its mean position will be
→Two uniform solid spheres having unequal masses and unequal radii are released from rest from the same height on a rough incline. If the spheres roll without slipping,
A conveyor belt is moving at a constant speed of $2\, m s^{-1}$. A box is gently dropped on it. The coefficient of friction between them is $\mu = 0.5.$ The distance that the box will move relative to belt before coming to rest on it, taking $g = 10\, m s^{-2},$ is ........... $m$
→If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may be:
- Going up with increasing speed.
- Going down with increasing speed.
- Going up with uniform speed.
- Going down with uniform speed.
A ball is thrown from ground at an angle $\theta$ with horizontal and with an initial speed $u_0$. For the resulting projectile motion, the magnitude of average velocity of the ball up to the point when it hits the ground for the first time is $V _1$. After hitting the ground, ball rebounds at the same angle $\theta$ but with a reduced speed of $u_0 / \alpha$. Its motion continues for a long time as shown in figure. If the magnitude of average velocity of the ball for entire duration of motion is $0.8 V _1$, the value of $\alpha$ is. . . . . .
→