Download App

Light Waves — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 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
    $v_A > v_B > v_C$
  • B
    $v_A < v_B < v_C$
  • ✓
    $v_A = v_B = v_C$
  • D
    $\text{v}_\text{B}=\frac{1}{2}(\text{v}_\text{A}+\text{v}_\text{C})$
✓

Answer

Correct option: C.
$v_A = v_B = v_C$
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 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Photoelectric effect was successfully explained first by:
→
One junction of a certain thermoelectric couple is at a fixed temperature $T_r$ and the other junction is at temperature $T.$ The thermo electromotive force for this is expressed by $E=K\left(T-T_r\right)\left[T_0-\frac{1}{2}\left(T+T_r\right)\right]$. . At temperature $T =\frac{1}{2} T_0$ the thermoelectric power is
→
Focal length of a convex lens will be maximum for(a) Blue light(b) Yellow light(c) Green light(d) Red light
       
→
The kinetic energy of an electron which is accelerated through a potential of $100$ volts is
→
The quantities that remain conserved in a nuclear reaction :
→
In a semiconductor:
→
Two coherent sources separated by distance $d$ are radiating in phase having wavelength $l.$ A detector moves in a big circle around the two sources in the plane of the two sources. The angular position of $n = 4$ interference maxima is given as
→
A resistance of $4 \Omega$  and a wire of length $5$ metres and resistance $5 \Omega$  are joined in series and connected to a cell of $\text{e.m.f.} 10 V$ and internal resistance $1 \Omega.$ A parallel combination of two identical cells is balanced across $300 \ cm$ of the wire.  The $\text{e.m.f. E}$ of each cell is
→
The formula of torque due to electric dipole is:
→
In an elastic collision:
  1. The kinetic energy remains constant.
  2. The linear momentum remains constant.
  3. The final kinetic energy is equal to the initial kinetic energy.
  4. The final linear momentum is equal to the initial linear momentum.
→