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1.8 gm of H-atom sample is excited by ra...

`1.8` gm of H-atom sample is excited by radiations. The study of spectra indicates that `27%` of the atoms are in 3rd energy level, `15%` of atoms in 2nd energy level and test in ground state

A

Number of atoms in 2nd energy level is `1.626 xx 10^(23)` atoms

B

Number of atoms in 3rd energy level is `2.9268 xx 10^(23)` atoms

C

Number of atoms in Ground state is `6.2872 xx 10^(23)` atoms

D

All are correct

Text Solution

Verified by Experts

The correct Answer is:
D
No. of atoms `= n xx N_0 xx (%)/(100)`
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1.8 g hydrogen atoms are excited to raditions . They study of spectra indicates that 27% of the atoms are in 3rd energy level and 15% of atom in 2nd energy level and the rest in ground state .If .I.P.of H is 21.7xx10^(-8) erg . Calcute- (i) No. the atoms present in III & II energy level . (ii) Total energy evolved when all the atoms when all the atoms return to ground state.

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Knowledge Check

  • 1.8 g of hydrogen is excite by irradiation. The study of spectra indicated that 27 % of the atoms are in the first excite state, 15 % of the aton in the second excited, and the rest in the ground state. The ground stat, ionization energy of hydrogen atom is 21.4 xx 10^(-12) ergs. The number of atoms present in the second excited state is

    A
    `1.61 xx 10^(23)`
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    `0.805 xx 10^(23)`
    C
    `2.92 xx 10^(23)`
    D
    `1.46 xx 10^(23)`

  • 1.8 g of hydrogen is excite by irradiation. The study of spectra indicated that 27 % of the atoms are in the first excite state, 15 % of the aton in the second excited, and the rest in the ground state. The ground stat, ionization energy of hydrogen atom is 21.4 xx 10^(-12) ergs. The total amount of energy that would be evolved when all the atoms neutron to the ground state is

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