Question:
Which one of the following attributes of an electromagnetic wave remains constant when it enters from air to water?
Which one of the following attributes of an electromagnetic wave remains constant when it enters from air to water?
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Frequency is the "identity" of the wave; it stays the same from start to finish.
Updated On: May 13, 2026
- Wavelength
- Velocity
- Frequency
- Colour
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The Correct Option is C
Solution and Explanation
Step 1: Concept
When a wave transitions between media, its speed changes based on the refractive index ($v = c/n$).
Step 2: Meaning
The wave equation is $v = f\lambda$. Since velocity ($v$) changes and frequency ($f$) is determined by the source, wavelength ($\lambda$) must also change to satisfy the equation.
Step 3: Analysis
Frequency depends solely on the vibration of the source that created the wave. It does not change regardless of the medium the wave travels through.
Step 4: Conclusion
While velocity and wavelength decrease when entering a denser medium like water, the frequency remains constant. Final Answer: (C)
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