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Visible spectrum contains light of following colours“Violet - Indigo - Blue - green - Yellow - Orange - Red” (VIBGYOR).
Its frequency ranges from Violet (7.5×10¹⁴ Hz) to Red (4×10¹⁴ Hz). Find out the maximum wavelength in this range:

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400 Å

750 Å

7500 Å

4000 Å

answer is D.

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Detailed Solution

Maximum wave length will correspond to minimum frequency.
Minimum frequency for red light
$λ_{max} = \frac{C}{V_{min}} = \frac{3 \times 10^{8} m / s}{4 \times 10^{14} m} = 750 \times 10^{- 9} m = 7500 Å$

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