JEE Main & NEET Physics Quiz – Dual Nature of Matter and Radiation

Vagupu is helping JEE Main, NEET and CBSE Class 12 Physics students, by providing previous year Physics exam questions of Dual Nature of Matter and Radiation. These questions will help you in better Physics exam preparation. Dual Nature of Matter and Radiation Questions

Dual Nature of Matter and Radiation Questions

1. The work function of metals is in the range of 2 eV to 5eV. Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck constant = 4 × 10^–15 eVs, velocity of light = 3 × 10⁸m/s) [WB JEEM 2015]

 (A) 510 nm

 (B) 650 nm

 (C) 400 nm

  D) 570 nm

Question 1 of 10

2.

Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively, successively illuminate a metallic surface whose work function is 0.5 eV. Ratio of maximum speeds of emitted electrons will be [Karnataka CET 2015]

 (A) 1 : 2

 (B) 1 : 5

 (C) 1 : 1

 (D) 1 : 4

Question 2 of 10

3.

The maximum kinetic energy of the photoelectrons depends only on [Karnataka CET 2014]

 (A) potential

 (B) frequency

 (C) incident angle

 (D) pressure

Question 3 of 10

4.

An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m². The de Broglie wavelength associated with the particle will be [CBSE AIPMT Preliminary 2012]

•  (A) 10 Å
•  (B) 0.01 Å
•  (C) 1 Å
•  (D) 0.1 Å

  (A) 10 Å

 (B) 0.01 Å

 (C) 1 Å

 (D) 0.1 Å

Question 4 of 10

5.

After absorbing a slowly moving neutron of mass m_N (momentum ~ 0) a nucleus of mass M breaks into two nuclei of masses m₁ and 5m₁ (6m₁ = M + m_N), respectively. If the de Broglie wavelength of the nucleus with mass m₁ is λ, the de Broglie wavelength of the other nucleus will be [AIEEE 2011]

 (A) λ

 (B) 25 λ

 (C) 5 λ

 (D) λ/5

Question 5 of 10

6.

A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photo-electric current for this light is 3V₀. If the same surface is illuminated with light of wavelength 2λ, the stopping potential is V₀. The threshold wavelength for this surface for photoelectric effect is [CBSE AIPMT 2015]

  (A) 6λ

 (B) 4λ

 (C) λ/4

 (D) λ/6

Question 6 of 10

7.

Find the de-Broglie wavelength of an electron with kinetic energy of 120 eV. [Karnataka CET 2015]

  (A) 112 pm

 (B) 95 pm

 (C) 124 pm

 (D) 102 pm

Question 7 of 10

8.

If the momentum of an electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%. The initial momentum of electron will be [AIPMT MAIN EXAMINATION – 2012]

  (A) 200 P

 (B) 400 P

 (C) P/200

 (D) 100 P

Question 8 of 10

9.

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately: [AIEEE 2004]

 (A) 540 nm

  (B) 400 nm

 (C) 310 nm

 (D) 220 nm

Question 9 of 10

10.

Light of wavelength ‘λ’ which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity then stopping potential will [MHT CET 2016]

 (A) increase

 (B) decrease

 (C) be zero

 (D) become exactly half

Question 10 of 10

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