Structure of Atom Test

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Structure of Atom Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

The wavelength of radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1·09 × 10⁷ m^–1)

A
91nm

B
9·1 × 10^–8 nm

C
406 nm

D
192 nm
Question 2
4 / -1

The relationship between energy E, of the radiation with a wavelength 8000 Å and the energy of the radiation with a wavelength 16000 Å is

A
E₁ = 6E₂

B
E₁ = 2E₂

C
E₁ = 4E₂

D
E₁ = 1/2E₂
Question 3
4 / -1

Which of the following statements in relation to the hydrogen atom is correct?

A
3s – orbital is lower in energy than 3p-orbital

B
3p – orbital is lower in energy than 3d-orbital

C
3s and 3p orbitals arc of lower energy than 3d orbital

D
3s, 3p and 3d orbitals all have the same energy
Question 4
4 / -1

The most probable radius (in pm) for finding the electron in He⁺ is

A
0·0

B
52·9

C
26·5

D
105·8
Question 5
4 / -1

If the speed of electron in Bohr first orbit of hydrogen atom be x, then speed of the electron in 3rd orbit is

A
x/9

B
x/3

C
3x

D
9x
Question 6
4 / -1

The wave number of first line of Balmer series of hydrogen is 15200 cm^–1. The wave number of the first Balmer line of Li⁺¹ ion is

A
15200 cm^–1

B
60800 cm^–1

C
76000cm^–1

D
136,800cm^–1
Question 7
4 / -1

The radius of which of the following orbits is same as that of the first Bohr’s orbit of hydrogen atom ?

A
He⁺ (n = 2)

B
Li²⁺ (n = 2)

C
Li²⁺ (n = 3)

D
Be³⁺ (n = 2)
Question 8
4 / -1

A cricket ball of 0.5 kg is moving with a velocity of 100 m/s. The wavelength associated with its motion is

A
0.01 cm

B
6.6 × 10^-34 m

C
1.32 × 10^-35 m

D
6.6 × 10^-28 m

Solution
Question 9
4 / -1

What is the frequency of photon whose momentum is 1.1 × 10^-23 kg ms^-2 ?

A
5 × 10¹⁶ Hz

B
5 × 10¹⁷ Hz

C
0.5 × 10¹⁸ Hz

D
5 × 10¹⁸ Hz

Solution
Question 10
4 / -1

What accelerating potential is needed to produce an electron beam with an effective wavelength of 0.090 Å ?

A
1.86 × 10⁴ eV

B
1.86 × 10² eV

C
2.86 × 10⁴ eV

D
2.86 × 10² eV

Solution

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Structure of Atom Test - 21

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Structure of Atom Test - 21

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Question 1

91nm

9·1 × 10–8 nm

406 nm

192 nm

Question 2

E1 = 6E2

E1 = 2E2

E1 = 4E2

E1 = 1/2E2

Question 3

3s – orbital is lower in energy than 3p-orbital

3p – orbital is lower in energy than 3d-orbital

3s and 3p orbitals arc of lower energy than 3d orbital

3s, 3p and 3d orbitals all have the same energy

Question 4

0·0

52·9

26·5

105·8

Question 5

x/9

x/3

3x

9x

Question 6

15200 cm–1

60800 cm–1

76000cm–1

136,800cm–1

Question 7

He+ (n = 2)

Li2+ (n = 2)

Li2+ (n = 3)

Be3+ (n = 2)

Question 8

0.01 cm

6.6 × 10-34 m

1.32 × 10-35 m

6.6 × 10-28 m

Solution

Question 9

5 × 1016 Hz

5 × 1017 Hz

0.5 × 1018 Hz

5 × 1018 Hz

Solution

Question 10

1.86 × 104 eV

1.86 × 102 eV

2.86 × 104 eV

2.86 × 102 eV

Solution

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9·1 × 10^–8 nm

E₁ = 6E₂

E₁ = 2E₂

E₁ = 4E₂

E₁ = 1/2E₂

15200 cm^–1

60800 cm^–1

76000cm^–1

136,800cm^–1

He⁺ (n = 2)

Li²⁺ (n = 2)

Li²⁺ (n = 3)

Be³⁺ (n = 2)

6.6 × 10^-34 m

1.32 × 10^-35 m

6.6 × 10^-28 m

5 × 10¹⁶ Hz

5 × 10¹⁷ Hz

0.5 × 10¹⁸ Hz

5 × 10¹⁸ Hz

1.86 × 10⁴ eV

1.86 × 10² eV

2.86 × 10⁴ eV

2.86 × 10² eV