Atomic Structure Test

Result

Atomic Structure Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

The de Broglie wavelength associated with a ball of mass 200 g and moving at a speed of 5 metres/hour, is of the order of (h = 6.625 x 10^-34 J s) is

A
10^-15 m

B
10^-20 m

C
10^-25 m

D
10^-30 m

Solution

According to de Broglie’s equation
Question 2
1 / -0

A body of mass 10 g is moving with a velocity of 100 m s^-1. The wavelength associated with it is

A
6.626 x 10^-7 m

B
6.626 x 10^-34 m

C
6.626 x 10^-4 m

D
6.626 x 10^-35 m

Solution
Question 3
1 / -0

The wavelength of an electron moving with velocity of 10⁷ m s^-1 is

A
7.27 x 10^-11 m

B
3.55 x 10^-11 m

C
8.25 x 10^-4 m

D
1.05 x 10^-16m

Solution
Question 4
1 / -0

What will be the wavelength of an electron moving with 1/10th of velocity of light?

A
2.43 x 10^-11 m

B
243 x 10^-11 m

C
0.243 m

D
2.43 x 10^-4 m

Solution
Question 5
1 / -0

If the velocity of an electron in Bohr’s first orbit is 2.19 x 10⁶ m s^-1, what will be the de Broglie wavelength associated with it?

A
2.19 x 10^-6 m

B
4.38 x 10^-6 m

C
3.32 x 10^-10 m

D
3.32 x 10¹⁰ m

Solution
Question 6
1 / -0

Match the column I with column II and mark the appropriate choice.

A
(A) → (iii), (B) → (iv), (C) → (i), (D) → (ii)

B
(A) → (ii), (B) → (i), (C) → (iv), (D) → (iii)

C
(A) → (iv), (B) → (iii), (C) → (i), (D) → (ii)

D
(A) → (i), (B) → (ii), (C) → (iv), (D) → (iii)
Question 7
1 / -0

If uncertainty principle is applied to an object of mass 1 milligram, the uncertainty value of velocity and position will be

A
0.2 x 10^-4 m² s^-1

B
0.52 x 10⁶ m² s^-1

C
0.52 x 10^-28 m² s^-1

D
2 x 10^-34 m² s^-1

Solution

= 0.52 x 10^-28 m² s^-1 (1 mg = 10^-6 kg)
Question 8
1 / -0

What will be the uncertainty in velocity of a bullet with a mass of 10 g whose position is known with ± 0.01 mm?

A
5.275 x 10^-33 m s^-1

B
5.275 x 10^-25 m s^-1

C
5.275 x 10^-5 m s^-1

D
5.275 x 10^-28 m s^-1

Solution

Δx = ± 0.01 mm = 1 x 10^-5 m,
m = 10 g = 1 x 10^-2kg

= 5.275 x 10^-28m s^-1.
Question 9
1 / -0

What will be the mass of a particle if uncertainty in its position is 10^-8 m and velocity is 5.26 x 10^-25 m s^-1?

A
0.01 kg

B
0.1 kg

C
1kg

D
10 kg

Solution

Δx·mΔv = h/4π
Question 10
1 / -0

What will be the uncertainty in velocity of an electron when the uncertainty in its position is 1000 Å?

A
5.79 x 10² m s^-1

B
5.79 x 10⁸ m s^-1

C
5.79 x 10⁴ m s^-1

D
5.79 x 10^-10 m s^-1

Solution

Δx·mΔv = h/4π
Δx - 1000 Å = 1000 x 10^-10 m or 10^-7 m