Structure of Atom Quiz 4 – Punjab Meritorious School Preparation Portal

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Positron is :

electron with positive charge

a nucleus with one neutron and one proton

a nucleus with two protons

a helium nucleus

In a Bohr model of an atom, when an electron jumps from n = 3 to n = 1, how much energy will be emitted?

When atoms are bombarded with alpha particles, only, a few in million suffer deflection, others pass out undeflected. This is because

the force of repulsion on the moving alpha particle is small

the force of attraction between alpha particle and oppositely charged electrons is very small

there is only one nucleus and large number of electrons

the nucleus occupies much smaller volume compared to the volume of the atom

The configuration 1s², 2s², 2p⁵, 3s¹ shows:

excited state of - O2

excited state of neon atom

excited state of fluorine atom

ground state of fluorine atom

1.93 cm

3.84 cm

5.76 cm

7.68 cm

6.56 nm

65.6 nm

656 nm

0.656 nm

Which of the following statements about the electron is incorrect?

It is negatively charged particle

The mass of electron is equal to the mass of neutron.

It is a basic constituent of all atoms.

It is a constituent of cathode rays.

In the photo-electron emission, the energy of the emitted electron is

greater than the incident photon

same as than of the incident photon

smaller than the incident photon

proportional to the intensity of incident photon

The ionisation potential of a hydrogen atom is –13.6 eV. What will be the energy of the atom corresponding to n = 2.

– 3.4 eV

– 6.8 eV

– 1.7 eV

–2.7 eV

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