Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 43

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Weekly Quiz Competition

Question 1
4 / -1

The kinetic energy of electron and proton is 10^–32 J. Then the relation between their de-Broglie wavelengths is

A
λ_p< λ_e

B
λ_p > λ_e

C
λ_p = λ_e

D
λ_p = 2 λ_e

Solution
Question 2
4 / -1

The kinetic energy of an electron with de-Broglie wavelength of 0.3 nanometer is

A
0.168 eV

B
16.8 eV

C
1.68 eV

D
2.5 eV

Solution
Question 3
4 / -1

The wavelength of de-Broglie wave is 2µm, then its momentum is (h = 6.63 × 10^–34 J–s)

A
3.315 × 10^–28 kg-m/s

B
1.66 × 10^–28 kg-m/s

C
4.97 × 10^–28 kg-m/s

D
9.9 × 10^–28 kg-m/s

Solution
Question 4
4 / -1

Davisson and Germer experiment proved

A
Wave nature of light

B
Particle nature of light

C
Both (a) and (b)

D
Neither (a) nor (b)
Question 5
4 / -1

If the kinetic energy of a free electron doubles, its de-Broglie wavelength changes by the factor

A

B

C
1/2

D
2

Solution
Question 6
4 / -1

The de-Broglie wavelength of an atom at absolute temperature T K will be

A

B

C

D

Solution
Question 7
4 / -1

The de-Broglie wavelength of the electron in the ground state of the hydrogen atom is…. (radius of the first orbit of hydrogen atom = 0.53 Å)

A
1.67 Å

B
3.33 Å

C
1.06 Å

D
0.53 Å

Solution
Question 8
4 / -1

The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is

A
9.1 × 10^–24

B
6.5 × 10^–24

C
5.4 × 10^–24

D
1.6 × 10^–24

Solution
Question 9
4 / -1

The sun radiates energy at the rate of 3.77 × 10²⁶ J/s. The loss of mass it suffers per seconds is

A
41.9 × 10¹⁸ g

B
41.9 × 10⁸ kg

C
1.29 × 10¹⁶ kg

D
1.29 × 10¹⁰ kg

Solution
Question 10
4 / -1

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV. nm)

A
3.09 eV

B
1.43 eV

C
1.51 eV

D
1.68 eV

Solution