Yellow light emitted from a sodium lamp has a wave length(λ) of 580 nm. Calculate wave number (v¯) of the yellow light.

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1.927×105 cm-1

1.724×104 cm-1

1.0021×10-5 cm-1

2.147×10-4 cm-1

answer is B.

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Detailed Solution

Frequency, v=cλ1 nm=10-9 m580 nm=580×10-9 m=580×10-7 cm Wave number, V¯=1λ=1580×10-7 cm=1.724×104 cm-1

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