If the speed of light in vacuum is 3 × 10⁸ m/s and its frequency is 6 × 10¹⁴ Hz, what is its wavelength?

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1. Use the wave formula: $\lambda = \frac{c}{f}$.  
2. Put values: $\lambda = \dfrac{3	imes10^{8}}{6	imes10^{14}}\ 	ext{m}$.  
3. Compute: $\lambda = 0.5	imes10^{-6}\ 	ext{m} = 0.5\ \mu	ext{m}$.  
4. So the correct choice is **(a) 0.5 μm**.  
FINAL_ANSWER: a

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