Question:
If \( v_g, v_X \) and \( v_v \) are the speeds of gamma rays, X-rays and visible light respectively in vacuum, then
If \( v_g, v_X \) and \( v_v \) are the speeds of gamma rays, X-rays and visible light respectively in vacuum, then
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All electromagnetic waves have the same speed in vacuum irrespective of wavelength or frequency.
Updated On: Apr 21, 2026
- \( v_g>v_v>v_X \)
- \( v_g<v_v<v_X \)
- \( v_g = v_v = v_X \)
- \( v_g>v_v<v_X \)
- \( v_X<v_g<v_v \)
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The Correct Option is C
Solution and Explanation
Concept:
All electromagnetic waves travel with the same speed in vacuum.
Step 1: Nature of radiations.
Gamma rays, X-rays and visible light are electromagnetic waves.
Step 2: Speed in vacuum.
\[ c = 3 \times 10^8 \ \text{m/s} \]
Step 3: Conclusion.
\[ v_g = v_X = v_v = c \]
Step 1: Nature of radiations.
Gamma rays, X-rays and visible light are electromagnetic waves.
Step 2: Speed in vacuum.
\[ c = 3 \times 10^8 \ \text{m/s} \]
Step 3: Conclusion.
\[ v_g = v_X = v_v = c \]
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