Structure of Atom Test

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Structure of Atom Test - 3

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Question 1
1 / -0

Isobars are the atoms with

A
same atomic number but different number of neutrons

B
same mass number but different atomic number

C
same atomic number but different mass number

D
same number of neutrons but different mass number

Solution

Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number.
Question 2
1 / -0

When an electric discharge is passed through gaseous hydrogen, the H₂ molecules dissociate and the energetically excited hydrogen atoms produced emit electromagnetic radiation of discrete frequencies. The hydrogen spectrum consists of

A
several lines named after their discoverers

B
several series of lines named after their discoverers

C
a continuous spectrum that reduces to zero at small wavelengths

D
a continuous spectrum that reduces to zero at large wavelengths

Solution

The emission spectrum of hydrogen consists of several series of sharp emission lines in the ultraviolet (Lyman series). in the visible (Balmer series). and in the infrared (Paschen series, Brackett series, etc,) regions of the spectrum. These series are named after their discoverer.
Question 3
1 / -0

A 100-watt bulb emits light having wavelength 5 x 10^-7 m. Calculate the number of photons emitted per second by the bulb.

A
11.5 x 10¹⁸

B
2.51 x 10²⁰

C
3.975 x 10^-19

D
5.34 x 10^-17
Question 4
1 / -0

Emission spectrum of a material results from the material's (atom or molecules)

A
transition from excited to normal state

B
transition from normal to excited state

C
radiating a continuous spectrum

D
radiating an inverted spectrum

Solution

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. The photon energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference. This collection of different transitions, leading to different radiated wavelengths, make up an emission spectrum.
Question 5
1 / -0

A gas absorbs a photon having wavelength 400 nm and then re-emits two photons. If the wavelength of one photon is 800 nm, then the wavelength of the second photon will be:

A
1000 nm

B
200 nm

C
600 nm

D
800 nm
Question 6
1 / -0

The wave number of H_βline in the Paschen series of hydrogen emission spectrum is:

A
7099.2 cm^-1

B
7000 cm^-1

C
6999.2 cm^-1

D
7799.2 cm^-1
Question 7
1 / -0

Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for a given material results from the material's (atom or molecules)

A
absorbing all wavelengths and returning to normal ground state

B
absorbing selected wavelengths from an input of continuous spectrum

C
absorbing selected wavelengths and returning to normal ground state

D
absorbing all wavelengths from an input of continuous spectrum

Solution

In an absorption spectrum, portions of a continuous spectrum (light containing all wavelengths) are missing because they have been absorbed by the medium through which the light has passed; the missing wavelengths appear as dark lines or gaps.
Question 8
1 / -0

The relation between the energies of two different radiations whose wavelengths are 800 nm and 400 nm is:

A
E₁ = E₂

B
2E₂ = E₁

C
E₂ = 2E₁

D
E₂ = E₁
Question 9
1 / -0

The total energy of an electron in the first excited state of the hydrogen atom is about −3.4 eV. What is the kinetic energy of the electron in this state?

A
-3.4 eV

B
+1.7 eV

C
+6.8 eV

D
+3.4 eV

Solution

Total energy of the electron, E = −3.4 eV
Kinetic energy of the electron is equal to the negative of the total energy.
K = −E = − (− 3.4) = +3.4 eV
Hence, the kinetic energy of the electron in the given state is +3.4 eV.

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 3

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Structure of Atom Test - 3

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SHARING IS CARING

Question 1

same atomic number but different number of neutrons

same mass number but different atomic number

same atomic number but different mass number

same number of neutrons but different mass number

Solution

Question 2

several lines named after their discoverers

several series of lines named after their discoverers

a continuous spectrum that reduces to zero at small wavelengths

a continuous spectrum that reduces to zero at large wavelengths

Solution

Question 3

11.5 x 1018

2.51 x 1020

3.975 x 10-19

5.34 x 10-17

Question 4

transition from excited to normal state

transition from normal to excited state

radiating a continuous spectrum

radiating an inverted spectrum

Solution

Question 5

1000 nm

200 nm

600 nm

800 nm

Question 6

7099.2 cm-1

7000 cm-1

6999.2 cm-1

7799.2 cm-1

Question 7

absorbing all wavelengths and returning to normal ground state

absorbing selected wavelengths from an input of continuous spectrum

absorbing selected wavelengths and returning to normal ground state

absorbing all wavelengths from an input of continuous spectrum

Solution

Question 8

E1 = E2

2E2 = E1

E2 = 2E1

E2 = E1

Question 9

-3.4 eV

+1.7 eV

+6.8 eV

+3.4 eV

Solution

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11.5 x 10¹⁸

2.51 x 10²⁰

3.975 x 10^-19

5.34 x 10^-17

7099.2 cm^-1

7000 cm^-1

6999.2 cm^-1

7799.2 cm^-1

E₁ = E₂

2E₂ = E₁

E₂ = 2E₁

E₂ = E₁