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Calculate the wavelength, frequency, and...

Calculate the wavelength, frequency, and wave number of a light wave whose period is `2.0 xx10^(-10) s`.

Text Solution

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Period of the light wave, `T=2xx10^(10)s`
So, frequency of light wave,
`v=1/T=(1)/(2xx10^(-10)s)=5xx10^(9)s^(-1)=5xx10^(9)" Hz"`
Wavelength of the light wave,
`lamda=(c)/(v)=cxxT=3xx10^(8)" ms"^(-1)xx2xx10^(-10)s=6xx10^(-2)m`
Wave number of the light wave,
`bar(v)=(1)/(lamda)=(1)/(6xx10^(-2)m)=16.66" m"^(-1)`
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Knowledge Check

  • What is the frequency of light wave whose time period is 2.0 xx10^(10) sec

    A
    `5xx10^(9)` s
    B
    `4 xx10^(9)` s
    C
    `5xx10^(-11) s^(-1)`
    D
    `4xx10^(9) s^(-1)`

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