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Find the minimum frequency of light whic...

Find the minimum frequency of light which can ionise a hydrogen atom.

A

`3.28xx10^(15)Hz`

B

`5xx10^(15)Hz`

C

91.1 Hz

D

None of these

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The first ionization energy of caesium is 6.24 xx 10^(-19)J//"atom" . What is the minimum frequency of light that is required to ionize a caesium atom ?

    A
    `1.06 xx 10^(-15)s^(-1)`
    B
    `4.13 xx 10^(14) s^(-1)`
    C
    `9.42 xx 10^(14) s^(-1)`
    D
    `1.60 xx 10^(18) s^(-1)`

  • The ionisation energy of gaseous Na atoms is 495.8 KJ mol^(-1) . The lowest possible frequency of light that can ionise a Na atom is

    A
    `1.24xx10^(15) s^(-1)`
    B
    `4.76 xx 10^(14) s^(-1)`
    C
    `1.24xx10^(12) s^(-1)`
    D
    `3.15 xx 10^(14) s^(-1)`

  • Photons of minimum energy 496k,J. mol^(-1) are needed to an atoms. Calculate the lowest frequency of light that will ionize a sodium atom.

    A
    `1.24xx10^(14)s^(-1)`
    B
    `1.24xx10^(15)s^(-1)`
    C
    `2.48xx10^(15)s^(-1)`
    D
    `2.48xx10^(14)s^(-1)`

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