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The first ionization energy of Na is 495...

The first ionization energy of Na is 495.9 kJ `mol^(-1)` . What is the longest wavelength of light that could remove an electron from a Na-atom?

A

`2.41 xx 10^(-7)m`

B

`2.41 xx 10^(-4)m`

C

4.14 m

D

`4.14 xx 10^(3) m`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The energy required to ionize a potassium ion is 419 kJ mol^(-1) . What is the longest wavelength of light that can cause this ionization ?

    A
    285 nm
    B
    216 nm
    C
    200 nm
    D
    107 nm

  • 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)`

  • 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)`

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