Atoms Test

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Atoms Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

The ionisation potential of hydrogen atom is -13.6 eV. An electron in the ground state of a hydrogen atoms absorb a photon of energy 12.75 eV. How many different spectral line can one expect when the electron make a downward transition?

A
1

B
4

C
2

D
6

Solution

$$\displaystyle E={ { E }_{ 1 } }/{ { n }^{ 2 } }$$
Energy used for excitation is 12.75 eV
ie, (-13.6+12.75)eV = -0.85eV image
Energy levels of H-atom
The photons of energy 12.75eV can excite the fourth level of H-atom. Therefore, six lines will be emitted. $$ \left( n\frac { \left( n-1 \right) }{ 2 } lines \right) $$.
Question 2
1 / -0

What is the mass of neutron?

A
$$1.675\times 10^{-24}g$$

B
$$9.1\times 10^{-31} kg$$

C
$$1.675\times 10^{-30}g$$

D
$$9.1\times 10^{-27}kg$$

Solution

Mass of neutron is $$1.675\times 10^{-24}g$$ which is nearly the same as that of hydrogen atom.
Question 3
1 / -0

What is the electronic configuration of phosphorus?

A
2, 8, 5

B
2, 8, 4

C
2, 8, 6

D
2, 8, 3

Solution

Phosphorus has atomic no-17. so its k shell has 2 electron, L shell has 8 electron and M shell has 5 electron.
Question 4
1 / -0

A substance consisting of atoms which all have the same number of protons is called a/an

A
Element

B
Molecule

C
Mixture

D
Solution

Solution

An element is a substance consisting of atoms which all have the same number of proton i.e. the same atomic number.
Question 5
1 / -0

$$U^{235}, U^{238}, U^{239}$$ are the atoms of the uranium. Which are called as

A
Isomers

B
Isobars

C
Isotopes

D
None of these

Solution

Isotopes are the same element which have same atomic number but different mass numbers. $$U^{235}, U^{238}, U^{239}$$ all have different mass numbers.
Question 6
1 / -0

Which instrument was used for the discovery of the electron?

A
Plum Pudding Model

B
Oil Drop Apparatus

C
Gold Foil Experiment

D
Alpha Particle Emitter

E
Cathode Ray Tube

Solution

J. J. Thomson constructed a glass tube which was partially evacuated i.e. much of the air was pumped out of the tube. Then he applied a high electrical voltage between two electrodes at either end of the tube. He detected that a stream of particle (ray) was coming out from the negatively charged electrode (cathode) to positively charged electrode (anode). This ray is called cathode ray and the whole construction is called cathode ray tube.
Question 7
1 / -0

When a high energy (fast moving) electron approaches a heavy metal target, some of the electrons are significantly deflected by nuclei, and they lose much of their energy. This lost energy goes into the creation of high energy photons.
What process is being described here?

A
Compton scattering

B
The photoelectric effect

C
X-ray production

D
Pair production

E
Quantum tunneling

Solution

Compton scattering
Compton scattering is the scattering of a photon by a charged particle, usually an electron. It results in a decrease in energy (increase in wavelength) of the photon called the corrgton effect.
Question 8
1 / -0

A high energy photon collides elastically with a charged particle (usually an electron)., The photon "bounces away" with less energy (a longer wavelength).
The process described here is known as :

A
Compton scattering

B
The photoelectric effect

C
X-ray production

D
Annihilation

E
Quantum tunneling

Solution

Compton scattering is the scattering of a photon by a charged particle, usually an electron. It results in a decrease in energy (increase in wavelength) of the photon called the Compton effect.
Question 9
1 / -0

What is the correct order in which the listed atomic models were advanced and accepted, earliest first?

A
Bohr, planetary, plum pudding

B
Planetary, Bohr, plum pudding

C
Plum pudding, Bohr, planetary

D
Plum pudding, planetary, Bohr

E
Planetary, plum pudding, Bohr

Solution

J.J. Thomson proposed plum pudding model in 1904. Ernest Rutherford introduced the planetary model of an atom in 1911 which was modified by Neils Bohr in 1913 as Bohr model of an atom.
Order in which the atomic models were advanced : Plum pudding, planetary, Bohr
Question 10
1 / -0

Which of the following can produced emission spectrum ?

A
electrons in an excited gas jump up to a higher energy level and release photons.

B
electrons in an excited gas jump down to a lower energy level and release photons.

C
electrons are released from the outer orbitals of an excited gas.

D
an unstable nucleus releases energy.

E
light is shined on a metal surface and electrons are released.

Solution

When an electron makes a transition from higher energy level to a lower one in an atom, a photon is released with energy equal to the difference in the energy of the levels. Such a spectrum of electromagnetic energy is called emission spectrum.

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Atoms Test - 20

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Atoms Test - 20

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Question 1

1

4

2

6

Solution

Question 2

$$1.675\times 10^{-24}g$$

$$9.1\times 10^{-31} kg$$

$$1.675\times 10^{-30}g$$

$$9.1\times 10^{-27}kg$$

Solution

Question 3

2, 8, 5

2, 8, 4

2, 8, 6

2, 8, 3

Solution

Question 4

Element

Molecule

Mixture

Solution

Solution

Question 5

Isomers

Isobars

Isotopes

None of these

Solution

Question 6

Plum Pudding Model

Oil Drop Apparatus

Gold Foil Experiment

Alpha Particle Emitter

Cathode Ray Tube

Solution

Question 7

Compton scattering

The photoelectric effect

X-ray production

Pair production

Quantum tunneling

Solution

Question 8

Compton scattering

The photoelectric effect

X-ray production

Annihilation

Quantum tunneling

Solution

Question 9

Bohr, planetary, plum pudding

Planetary, Bohr, plum pudding

Plum pudding, Bohr, planetary

Plum pudding, planetary, Bohr

Planetary, plum pudding, Bohr

Solution

Question 10

electrons in an excited gas jump up to a higher energy level and release photons.

electrons in an excited gas jump down to a lower energy level and release photons.

electrons are released from the outer orbitals of an excited gas.

an unstable nucleus releases energy.

light is shined on a metal surface and electrons are released.

Solution

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