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Taking 1 ly (light year) = 9.3 xx 10^(15...

Taking 1 ly (light year) = `9.3 xx 10^(15)m` and one day = 86400 s, express the speed of light `(= 3`xx` 10^(8)ms^(-1)` as ly `(day)^(-1)`

Text Solution

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`2.79 xx 10^(-3) "ly" "day"^(-1)`
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Taking 1 ly (light year) = 9.3 xx 10^15m and one day = 86400 s, express the speed of light (= 3 xx 10^8 ms^(-1)) as ly "(day)"^(-1)

Express the speed of light in meter per pico second (c=3xx10^(8)ms^(-1)) .

Knowledge Check

  • 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) )

    A
    `6.67 xx 10^(15)`
    B
    `6.67 xx 10^(11)`
    C
    `4.42 xx 10^(-15)`
    D
    `4.42 xx 10^(-18)`

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

    A
    `6.67 xx 10^15`
    B
    `6.67 xx 10^11`
    C
    `4.42 xx 10^-15`
    D
    `4.42 xx 10^-18`

  • The velocity of light in glass medium is 2 xx 10^(8)m//s . The refractive index of glass if speed of light in air is 3 xx 10^(8)m//s is

    A
    `1.5`
    B
    `1.25`
    C
    `2.5`
    D
    `2.25`

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    Calculate the energy in MeV equivalent to the rest mass of an electron . Given that the rest mass of an electron , m=9.1 xx 10^(-31) kg , 1MeV = 1.6 xx 10^(-13) J and speed of light , c= 3 xx 10 ^(8) ms ^(-1) .

    The speed of light in air is 3 xx 10^(8) m/s. IN medium X its speed is 2 xx 10^(8) m/s and in medium Y the speed of light is 2.5 xx 10^(8) m/s. Calculate: a) ._("air")n_(X) b) ._(x)n_(y)

    Speed of light air is 3 xx 10^8 ms^(-1) and the speed of light in a medium is 2 xx 10^8 ms^(-1) . Find the refractive index of the medium with respect to air.

    Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass ? The speed of light in vacuum is 3 xx 10^(8) m s^(-1) .

    What is the work fimetion (in eV) of the metal if the light of wavelength 4000A generates photoelectrons of velocity 6 xx 10^(5) ms^(-1) from it? (Mass of electron= 9 xx 10^(-31) kg, Velocity of light = 3 xx 10^(8) ms^(-1) Planck’s constant= 6.626 xx 10^(-34) Js, Charge of electron = 1.6 xx 10^(19) JeV^(-1)

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