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What is the number of significant figure...

What is the number of significant figures in Avogadro's number `(6.0 xx 10^(23))` and Planck's constant `(6.62 xx 10^(-34) J s)`.

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Avogadro's number `(6.0 xx 10^(23))` has 2 significant figures while Planck's constant `(6.60 xx 10^(-34) Js)` has three significant figures since only significant figures of 6.0 and 6.62 are considered.
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when a certain energy is applied to an hydrogen atom, an electron jumps from n =1 to n = 3 state. Find (i) the energy absorbed by the electron. (ii) wavelength of radiation emitted when the electron jump back to its initial state. ( Energy of electron in first orbit = - 13.6 eV , Planck's constant = 6.6225 xx10^(-34) Js, Charge on electron = 1.6 xx10^(-19) C, speed of light in vacuum = 3xx10^(8)ms^(-1)

Knowledge Check

  • 2.1 xx 10^(-6)

    A
    4.5
    B
    4
    C
    4.3
    D
    3.3

  • The number of significant figures in 6.00xx10^6 is:

    A
    one
    B
    two
    C
    three
    D
    eight

  • The number of significant figures in 1.00 xx 10^6 is:

    A
    one
    B
    three
    C
    eight
    D
    eleven

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    The number of significant figures in the numbers 4.8000xx10^(4) and 48000.50 are respectively

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