Download App

Light Waves — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsLight Waves1 Mark
MCQ
Suppose the medium in the previous question is water. Select the correct option$(s)$ from the list given in that question.
  • A
    $v_{\mathrm{A}}>\mathrm{v}_{\mathrm{B}}>\mathrm{v}_{\mathrm{C}}$
  • B
    $v_{\mathrm{A}}<\mathrm{v}_{\mathrm{B}}<\mathrm{v}_{\mathrm{C}}$
  • ✓
    Both $A$ and $B$
  • D
    $\text{v}_\text{B}=\frac{1}{2}(\text{v}_\text{A}+\text{v}_\text{C})$
✓

Answer

Correct option: C.
Both $A$ and $B$
Since the speed of light is a universal constant,
$\text{v}_\text{A}=\text{v}_\text{B}=\text{v}_\text{C}=3\times 10^8\text{m/s}$
$\text{v}_\text{B}=\frac{1}{2}(\text{u}_\text{A}+\text{u}_\text{C})$ This expression also implies that $v_A = v_B = v_C$

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 Light Waves→Light Waves — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Physical independence of force is a consequence of
→
Figure shows the variation of a force $F$ acting on a particle along $x$-axis. If the particle begins at rest at $x=0$, what is the particle's coordinate when it again has zero speed?
→
In an elevator moving vertically up with an acceleration $'g\ ',$ the force exerted on the floor by a passenger of mass $M$ is:
→
A horizontal plane supports a stationary vertical cylinder of radius $R = 1\ m$ and a disc $A$ attached to the cylinder by a horizontal thread $AB$ of length $l_0 = 2\ m$ (seen in figure, top view). An intial velocity ($v_0 = 1\ m/s$) is imparted $AB$ to the disc as shown in figure. .......... $\sec$ long will it move along the plane until it strikes against the cylinder ? (All surface are assumed to be smooth)
→
If the length of second's pendulum is decreased by $2\%$, how many seconds it will lose per day ...... $\sec$
→
A fruit hanging from the top branch of a tree possesses:
→
Two point masses $m$ and $M$ are separated by a distance $L$. The distance of the centre of mass of the system from m is
→
$S.I.$ unit of universal gas constant is
→
Three blocks of masses $4\, kg, 8\,kg$ and $24 \,kg$ are connected to each other with  light strings and placed on a smooth horizontal floor as shown in figure. If the system  moves with an acceleration of $2\, ms^{-2}$, the applied force $F$ is ............ $N$
→
Given below are two statements:

$Statement$ $I$ : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water.

$Statement$ $II$ : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in cold water.

In the light of the above statements, choose the most appropriate from the options given below

→