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What physical quantity is the same for $X$-rays of wavelength $10^{-10} \mathrm{~m}$, red light of wavelength $6800 Å$ and radiowaves of wavelength $500 \mathrm{~m}$ ?
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The speed in vacuum is same for all of them. It is given byc $=3 \times 10^8 \mathrm{~m} / \mathrm{s}$.
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