Question 1 of 8beginner🧠 RememberVery Short1 mark

What physical quantity is the same for X-rays of wavelength 10–10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500m?

Correct Answer

The speed of all these electromagnetic waves in vacuum is the same (speed of light, c = 3×103 \times 10⁸ m/s).

Exercise: EXERCISES | Q: 8.3
For More Understanding

Explanation

According to the 'Points to Ponder' section in the textbook, 'The basic difference between various types of electromagnetic waves lies in their wavelengths or frequencies since all of them travel through vacuum with the same speed.' X-rays, red light, and radiowaves are all electromagnetic waves, and regardless of their different wavelengths or frequencies, they all travel through vacuum with the same speed (c = 3×103 \times 10⁸ m/s).

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