What physical quantity is the same for X-rays of wavelength $10^{- 10} m$ , red light of wavelength $6800 \circ A$ and radio waves of wavelength $500 m$ ?

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Solution

X-rays, red light and radio waves are all electromagnetic waves. The speed of propagation in vacuum is the same for all these waves. This speed is equal to $c = 3 \times 10^{8} m / s$ .
Since, we know that $c = λ f$

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