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The wavelength (in Å) of a photon having...

The wavelength (in `Å`) of a photon having energy 3 eV is approximately.
`[1eV =1.6 xx 10 ^(-12) erg]`
`[h =6.626 xx 10 ^(-27) erg s ]`

A

3000

B

4000

C

4141

D

7824

Text Solution

Verified by Experts

The correct Answer is:
C
`3eV =3 xx 1.6 xx 10 ^(-12) erg ` = Energy (E)
`lamda = (hc)/(E) = (6.626 xx 10 ^(-27) xx 3xx 10 ^(8))/(3xx1.6 xx 10 ^(-12))=4141(Å)`
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Knowledge Check

  • The wavelength in meters, of an object of mass 1.0g moving with a velocity of 1.0xx10^(4) cms^(-1) is (h = 6.626xx10^(-34)Js)

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    `n=2,l=0`
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  • The De- Broglie wavelength of an electron having 80eV energy is nearly (1ev=1.6xx106(-19)J) Mass of the electron =9xx10^(-31)kg Planck 's constant =6.6xx10^(-34)J-s

    A
    140Å
    B
    0.14Å
    C
    14Å
    D
    1.4Å

  • The wavelength in meters, of an object of mass 1.0g moving with a velocity of 1.0xx10^(4)cms^(-1) is (h = 6.626x10^(-34)Js)

    A
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