Atoms Test

Result

Atoms Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Ionisation potential of hydrogen atom is -13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be

A
one

B
two

C
four

D
three

Solution

When photon of energy 12.1 eV is incident, the hydrogen atom will be raised to the excited state having energy -13.6 + 12.1 i.e. - 1.5 eV. This state corresponds to n = 3. Therefore, three spectral line (corresponding to the transitions from n = 3 to n = 2, n = 3 to n = 1 and n = 1 states) will be emitted.
Question 2
1 / -0

The energy of a hydrogen atom in its ground state is -13.6 eV. The energy of the level corresponding to the quantum number n = 2 in the hydrogen atom is

A
-2.72 eV

B
-0.54 eV

C
-0.85 eV

D
-3.4 eV
Question 3
1 / -0

In terms of the Bohr radius a₀, the radius of the second Bohr orbit of a hydrogen atom is given by

A
√2 a₀

B
8 a₀

C
2 a₀

D
4 a₀

Solution

Since r ∝ n², the radius of the second orbit is 4 a₀
Question 4
1 / -0

Rutherford's model of the atom was unstable, because

A
electrons are repelled by the nucleus

B
nuclei will break down

C
orbiting electrons radiate energy

D
electrons move in circular orbits

Solution

Rutherford’s model of atom was unstable because he said that every electron revolving around a nucleus radiate energy, since every radiating energy has an acceleration, the electron would have felt inside nucleus, which results to unstablity of atom.