Physics- Atoms Set 1

1.

The first model of atom in 1898 was proposed by

Ernst Rutherford Albert Einstein J.J. Thomson Niels Bohr

2.

The Bohr model for the spectra of a H-atom

will be applicable to hydrogen in the molecular from. will not be applicable as it is for a He- atom. is valid only at room temperature. predicts continuous as well as discrete spectral lines.

3.

n would not be integral. Bohr-quantisation applies only to electron. the frame in which the electron is at rest is not inertial. the motion of the proton would not be in circular orbits, even approximately.

4.

Consider aiming a beam of free electrons towards free protons. When they scatter, an electron and a proton cannot combine to produce a H-atom,

because of energy loss. without simultaneously releasing energy in the from of radiation. because of momentum conservation. because of angular momentum conservation.

5.

For ionising an exicited hydrogan atom, the energy required (in eV) will be

a little less than 13.6 eV 13.6 eV more than 13.6 eV 3.4 or less

6.

The electrons in the Bohr's orbit have

K.E. greater than P.E. P.E. greater than K.E. the same values none of these

7.

it will not be absorbed at all. some of atoms will move to the first excited state. all atoms will be excited to the n = 2 state. all atoms will make a transition to the n = 3 state.

8.

The Bohr model of an atom

assumes that the angular momentum of electrons is quantised. uses Einstein's potoelectric equation. predicts continuous emission spectra for atoms, predicts the same emission spectra for all types of atoms.

9.

The Balmer series for the H-atom can be observed

if we measure the frequencies of light emitted when an excited atom falls to the ground state. if we measure the frequencies of light emitted due to transitions between excited states and the first excited state. in any transition in a H-atom. as a sequence of frequencies with the lower frequencies getting closely packed.

10.

An ionised H-molecule consists of an electron and two protons. The protons are separated by a small distance of the order of angstrom. In the ground state,

the electron would move in circular orbits. the energy would be (2)4 times that of a H-atom. the electrons, orbit would go around the protons. the molecule will soon decay in a proton and a H-atom.

Physics- Atoms Set 1

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Physics- Atoms Set 1

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