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The work function (phi0), of a metal X, ...

The work function `(phi_0)`, of a metal X, equals `3xx10^(-19)J`. Calculate the number (N) of photons, of light of wavelength 26.52nm, whose total energy equal W. Plank's constant `=6.63xx10^(-34)Js.`

Text Solution

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`W=nhv=nh//lamda`
`3xx10^(-19)=(n.6.63xx10^(34)xx3xx10^(8))/(26.52xx10^(-9))`
`n=(3xx10^(-19)xx26.52xx10^(-9))/(6.63xx10^(-34)xx3xx10^(8))`
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The momentum of a photon of de Broglie wavelength 5000Å is …………… . [Plank's constant =6.63xx10^(-34)J.s ]

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Knowledge Check

  • A Photon of red light having wavelength 600 nm has energy equal of (h=6.6xx10^(-34)Js) :

    A
    `3.3xx10^(-19)J`
    B
    `1.0xx10^(-19)J`
    C
    `3.0xx10^(-18)J`
    D
    `1xx10^(19)J`

  • Calculate the energy in joule corresponding to light of wavelength 45 nm (Planck.s constant h=6.63xx10^(-34) Js, speed of light c=3xx10^(8) ms^(-2))

    A
    `6.67xx10^(12)`
    B
    `4.42xx10^(-13)`
    C
    `4.42xx10^(-18)`
    D
    `6.67xx10^(12)`

  • Calculate the energy in joule corresponding to light of wavelength 45 nm (Planck.s constant h=6.63xx10^(-34) Js, speed of light c=3xx10^(8) ms^(-2))

    A
    `6.67xx10^(12)`
    B
    `4.42xx10^(-13)`
    C
    `4.42xx10^(-18)`
    D
    `6.67xx10^(12)`

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    Calculate the energy in joule corresponding to light of wavelength 45 nm (Planck's constant, h = 6.63 xx 10^(-34) Js, speed of light = 3 xx 10^(8) ms^(-1) )

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