Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 26

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Weekly Quiz Competition

Question 1
4 / -1

Wavelength of light incident on a photo - sensitive surface is reduced form 3500 Å to 290 mm. The change in stopping potential is....... (h = 6.625 × 10^–24 J.s)

A
42.73 × 10^–2 V

B
27.34 × 10^–2 V

C
73.42 × 10^–2 V

D
43.27 × 10^–2 V

Solution
Question 2
4 / -1

What should be the ratio of de-Broglie wavelength of an atom of nitrogen gas at 300 K and 1000 K. Mass of nitrogen atom is 4.7 × 10²⁶Kg and it is at 1 atm pressure Consider it as an ideal gas.

A
2.861

B
8.216

C
6.281

D
1.826

Solution
Question 3
4 / -1

An electric bulb of 100 W converts 3% of electrical energy into light energy. If the wavelength of light emitted is 6625 Å, the number of photons emitted is 1 s is........ (h = 6.625 × 10^–34 J.s)

A
10¹⁷

B
10¹⁹

C
10²¹

D
10¹⁵

Solution
Question 4
4 / -1

Work function of Zn is 3.74 eV. If the sphere of Zn is illuminated by the X-ray of wavelength 12 Å the maximum potential produced on the sphere is......... (h = 6.625 × 10^–34 J.s)

A
10.314 V

B
103.14 V

C
1031.4 V

D
10314 V

Solution
Question 5
4 / -1

Consider the radius of a nucleus to be 10^–15 m. If an electron is assumed to be in such nucleus, what will be its energy ? (me = 9.1 × 10^–3 kg, h = 6.625 × 10^–34 J.s )

A
5.59 × 10³

B
9.55 × 10³

C
5.95 × 10³

D
7.45 × 10³

Solution
Question 6
4 / -1

A proton falls freely under gravity of Earth. Its de Broglie wavelength after 10 s of its motion is......., Neglect the forces other than gravitational force.

A
3.96 Å

B
39.6 Å

C
6.93 Å

D
69.3 Å
Question 7
4 / -1

Compare energy of a photon of X-rays having 1Å wavelength with the energy of an electron having same de Broglie wavelength. (h = 6.625 × 10^–34 J.s, c = 10⁸ ms^–1 , 1eV = 1.6 × 10^–19 J)

A
8.24

B
2.48

C
82.4

D
24.8

Solution
Question 8
4 / -1

An electron is at a distance of 10 m form a charge of 10 C. Its total energy is 15.6 × 10^–10 J . Its de - Broglie wavelength at this point is...................
(h = 6.625 × 10^–34 J.s, m_e = 9.1 × 10^–31 kg, k = 9 × 10⁹ SI)

A
9.87 Å

B
9.87 Fermi

C
8.97 Å

D
8.97 Fermi
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

As shown in the figure, light of energy P (joule) is incident on a small, flat strip of metal of mass m, suspended with the help of weightless string of length l in 1s. All the energy incident on it is absorbed and the strip remains in equilibrium at an angle θ with respect to vertical. If the light is monochromatic, angle θ is................

A

B

C

D

Solution