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A photon has a wavelength of 3.5Å. Calcu...

A photon has a wavelength of 3.5Å. Calculate its mass (Plank's constant, = `6.626 xx 10^(-34)` Js . Velocity of light = `3 xx 10^(8) ms^(-1)`)

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The dual behaviour of matter was proposed by the French physicist , de Broglie. b) A moving electron has a de Broglie wavelength of 7 xx10^ (-7) m. Calculate its kinetic energy. (Plank's constant, = 6.626 xx 10^(-34) Js),( Mass of an electron = 9.1 xx 10^(-31) kg.)

The dual behaviour of matter was proposed by the French physicist, de-Brogile. A moving electron has a de-Brogile wavelength of 7.2xx10^-7 m. Calculate its kinetic energy. [Planck's constant = 6.626xx10^-34 Js, Mass of a electron = 9.1xx10^-31 kg )

Knowledge Check

  • A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emitted from the lamp per second ? ( h = 6.626 xx 10^(-34) Js, velocity of light = 3 xx 10^(8) ms^(-1) )

    A
    `1 xx 10^(19)`
    B
    `1 xx 10^(20)`
    C
    `1 xx 10^(21)`
    D
    `1 xx 10^(23)`

  • One milli watt of light of wavelength 4560 Å is incident on a cesium surface of work function 1.9 eV. Given that quantum of efficiency of photoelectric emission is 0.5%, Planck's constant, h=6.62 xx 10^(-34)Js , velocity of light, c=3xx10^8 m//s , the photoelectric current liberated is

    A
    `1.856 xx 106(-6)A`
    B
    `1.856xx 10^(-7)A`
    C
    `1.856xx 10^(-5)A`
    D
    `1.856xx 10^(-4)A`

  • What wavelength must electrom agnetic radiation have if a photon in the beam has the same momentum as an electron moving w ith a speed 1.1 xx 10^(5) m/s (Planck’s constant = 6,6 xx 10^(-34) J-s, rest mass of electron = 9 xx 10^(-31) kg?

    A
    2/3 nm
    B
    20/3 nm
    C
    4/3 nm
    D
    40/3 mn

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    Calculate the number of significant figures in the following values. a. Planck's constant '=6.626 xx 10^(34) Js' b. Avogadro number '=6.023 xx 10^(23)' c. Velocity of light '=3.0 xx 10^8 ms^(-1)' d. Electronic charge '=1.602 xx 10^(-19) C'

    The dual behaviour of matter was proposed by the French physicist, de Broglie. A moving electron has a de Broglie wavelengh 7xx10^(-7)m Calculate its kinetic energy. (Planck’s constant =6.626xx10^(-34)Js Mass of an electron 9.1xx10^(-31)kg )

    An electron is moving with a velocity of 2.5 xx 10^(6) ms^(-1) . If the uncertainty in its velocity is 0.1% , calculate the uncertainty in its position. (Plank's constant, h = 6.626 xx 10^(-34) Js),( Mass of the electron = 9.1 xx 10^(-31) kg.)

    The photon has a momentum as well as a wavelength . A photon has a mass of 8.6 xx 10^(-30) kg. Calculate the wavelength. [Plank's constant, h = 6.626 xx 10^(-34) Js]

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