Nuclei Test

Result

Nuclei Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

According to Bohr model radiation takes place when

A
there is transition from one of the unstable orbits of definite energy to another of same energy

B
there is transition from one of the stable orbits of definite energy to another of higher energy

C
there is transition from one of the stable orbits of definite energy to another of lower energy

D
there is transition from one of the unstable orbits of definite energy to another of higher energy

Solution

An electron radiates energy when it jumps from a higher energy (stable, non-radiating) orbit to a lower energy orbit. There is emissin of a photon during this process and the frequency of the photon emitted is given by hv = E_t - E_f where E_t and E_f are energies of the intial and final states, and E_t > E_f.
Question 2
1 / -0

Emission line spectra of different elements

A
is different

B
is not different

C
is the same if both elements are at the same temperature

D
is the same if both elements are in liquid form

Solution

Each element absorbs different amount of energy depending on the number of electrons it has and the electrons move to a higher energy level. After a short duration, these electrons come down, emitting light of definite wavelength and definite frequency. The number of electrons decides the wavelength and frequency of light emitted. Hence emission light spectra of different elements is different.
Question 3
1 / -0

Which of these statements about Bohr model applied to hydrogen atom correct?

A
hydrogen atom in its ground level has magnetic moment due to orbital motion

B
hydrogen atom in its ground level has no magnetic moment due to orbital motion

C
hydrogen atom in some orbits radiates electromagnetic waves

D
hydrogen atom in quantized orbits radiates electromagnetic waves

Solution

This behaviour of hydrogen atoms was explained beautifully by Bohr. But it couldnt be applied for complex atoms. Bohr couldnt understand why spectral lines of some atoms were further split into multiple lines in presence of magnetic field. It was further solved by understanding that each electron had a tiny magnetic effect. This was well explained by the Zeeman effect.