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Find the range of frequency of light tha...

Find the range of frequency of light that is visible to an average human being `(400nmltlamdalt700nm)`

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The correct Answer is:
A, C, D
Given that: `400nmltlamda,700nm`
`1/(700nm)lt1/lamdalt1/(400nm)`
`1/(7xx10^-7)lt1/lamdalt1/(4xx10^-7)`
`=(3xx10^8)/(7xx10^-7)ltc/lamdalt(3xx10^8)/(4xx10^-7)`
`[where c=sped of light `=3xx10^8m/s`]
`rarr 4.3xx10^14ltc/lamdalt7.5xx10^14`
`rarr 4.3x10^14Hzltflt7.5xx10^14Hz`
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