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Q.

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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a

400 Å

b

750 Å

c

7500 Å

d

4000 Å

answer is D.

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Detailed Solution

Maximum wave length will correspond to minimum frequency.
Minimum frequency for red light
λmax=CVmin=3×108m/s4×1014m=750×10−9m=7500Å

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