Structure of Atom Test

Result

Structure of Atom Test - 6

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Weekly Quiz Competition

Question 1
4 / -1

Radiation of λ = 155 nm was irradiated on Li (work function = 5eV) plate. The stopping potential (in eV) is.

A
3eV

B
4eV

C
0.3eV

D
0.5 eV

Solution

3 eV
Co_rite Actual
Correct option

= 8 – 5
= 3eV
∴ V₀ = 3 eV
Question 2
4 / -1

Increasing order of magnetic moment among the following species is __________ .
Na⁺, Fe⁺³, Co²⁺, Cr⁺²

A
Na⁺+32+ +2

B
Na⁺2+2+ +3

C
Na⁺2+2+ +3

D
Na⁺3+2+ +2

Solution

Na+, Co⁺², Cr²⁺, Fe⁺³

we get Na⁺, Co^+2, Cr²⁺, Fe⁺³
Question 3
4 / -1

If in the hydrogen atom P.E. at ∞ is choosen to be 13.6 eV then the ratio of T.E. to K.E. for 1^st orbit of H-atom is __________ .

A
Zero

B
1

C
2

D
3

Solution

Zero
Refrence level is I^st orbit
itself T. E. = 0
Ratio becomes zero
Question 4
4 / -1

The light radiations with discrete quantities of energy are called ___________ .

A
photons

B
laser

C
radar

D
photo electron

Solution

A photon is the quantum of electromagnetic radiation. The term quantum is the smallest elemental unit of a quantity, or the smallest discrete amount of something. Thus, one quantum of electromagnetic energy is called a photon. The plural of quantum is quanta.
Question 5
4 / -1

The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is

A
1/4

B
4

C
1/2

D
2

Solution
Question 6
4 / -1

The energy of electron is maximum at :

A
Nucleus

B
Ground state

C
First excited state

D
Infinite distance from the nucleus

Solution

An electron bound to the nucleus by the mutual attraction between unlike charges, has a negative energy. Its most tightly bound to the nucleus nearer it is to the nucleus. That is an electron has least energy when it is in the n=1 shell. As the electron moves away from the nucleus its energy becomes less and less negative, i.e. its energy increases. When the electron is not under the attractive Coulomb force of the nucleus its potential energy is zero and whatever energy it has now, is kinetic energy, which is always positive. So farther the electron more energy it has.
Question 7
4 / -1

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon:

A
3s

B
2p

C
2s

D
1s

Solution

Is → As it is the ground state
Question 8
4 / -1

The third line in Balmer series corresponds to an electronic transition between which Bohr's orbits in hydrogen :

A
5 → 3

B
5 → 2

C
4 → 3

D
4 → 2

Solution

Balmer means transition to n = 2
1. line → 3 to 2
2. line → 4 to 2
3. line → 5 to 2
Question 9
4 / -1

The orbital angular momentum of an electron in 2s orbital is :

A

B
zero

C

D

Solution

Orbital Angular momentum is given by [√l(l+1)]×h/2π
For s orbital, we have l = 0
Therefore orbital angular momentum = 0
Question 10
4 / -1

Which quantum number is not related with Schrodinger equation :

A
Principal

B
Azimuthal

C
Magnetic

D
Spin

Solution

Spin quantum number do not follow Schrodinger Wave Equation because it is related to spin of the electrons.It is needed to explain Pauli's exclusion principle which sates that no two electrons can share the same state (i.e. have the same quantum numbers) at the same time.Therefore, if the quantum numbers n, l and m are same then the electrons should have different spin.