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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 $v_A = v_B = v_C$

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