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The work function for tungsten and sodiu...

The work function for tungsten and sodium are `4.5 eV` and `2.3 eV` respectively . If the threshold wavelength `lambda` for sodium is `5460 Å`, the value of `lambda` for tungsten is

A

`528 Å`

B

`2791 Å`

C

`5893 Å`

D

`10683 Å`

Text Solution

Verified by Experts

The correct Answer is:
B
Since , `phi_(0) = (hc)/(lamda_0) , ` so `phi_(0_r)/phi_(0_(Na))=lamda_(Na)/(lamda_T)` or `lamda_T = lamda_(Na) xx(phi_(0_(Na)))/(phi_(0_(r)))=(5460xx2.3)/(4.5)=2791Å`
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Knowledge Check

  • The work functions of tungsten and sodium are 5.06 eV and 2.53 eV respectively. If the threshold wavelenth for sodium is 5896 Å , then the threshold wavelength for the tungsten will be

    A
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    B
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    C
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    D
    `2948 Å`

  • Work function of tungsten and sodium are 4.4 eV and 2.3 eV respectively . If threshold wavelength of sodium is 5460 Å , then the threshold wavelength of tungsten is

    A
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    B
    4840 Å
    C
    5460 Å
    D
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  • The work functions of potassium and sodium are 4.5 eV and 2.3 eV respectively. The approximate ratio of their threshold wavelength will be -

    A
    ` 1 : 2 `
    B
    ` 2 : 1 `
    C
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    D
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