CBSE Physics Electrons and Photons Test 2 Online
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CBSE Physics Electrons and Photons Test 2 Online

Test Name Electrons and Photons Test
Subject CBSE Physics
Test Type MCQs
Total Question 25
Total Marks 50
Total Time 20 Minutes
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Central Board of Secondary Education, CBSE is a Board of Education for public and private schools all India and they are responsible all subjects. Science subject Physics read and guide in all classes on regular basis. Our topics is Electrons and Photons from upper classes syllabus for preparation online. All students get most helpful questions answers test to take online and get some important rank score in examinations results.

CBSE Physics Electrons and Photons Test 2 Online

CBSE

1. A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 x 106 mas-1. The velocity of the particle is (mass of electron = 9.1 x 10-31 kg) ?

Question 1 of 15

2. Monochromatic light of wavelength 667 nm is produced by a helium neon laser. the power emitted is 9 mW. The number of photons arriving per second on the average at a target irradiated by  this beam is ?

Question 2 of 15

3. An electron moves with a velocity 1 x 103 m/s in a magnetic field of induction 0.3 T at an angle 30°. If e/m of electron is 1.76 x 1011 C/Kg, the radius of teh path is nearly ?

Question 3 of 15

4. The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the ?

Question 4 of 15

5. In a mas spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R  using a magnetic field B. If V and B are kept constant, the ratio [charge on the ion/mass of the ion] will be proportional too ?

Question 5 of 15

6. A light source is at a distance d from a photoelectric cell, then the number of photoelectrons emitted form the cell is n. If the distance of light source and cell is educed to half, the the number of photoelectrons emitted will become ?

Question 6 of 15

7. A 5 W source emits monochromatic light of wavelength 5000 A. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of ?

Question 7 of 15

8. Monochromatic light of frequency of 6.0 x 1014 Hz is produced by a laser. The power emitted is 2 x 10-3 W. The number of photons emitted, on the average, by the source per second is ?

Question 8 of 15

9. A photocell employs photoelectric effect to convert ?

Question 9 of 15

10. Einstein's work on photoelectric effect gives support to ?

Question 10 of 15

11. A photosensitive metallic surface has work function, h v0. If photons of energy 2hvo fall on this surface, the electrons come out with a maximum velocity of 4 x 106 m/s. When the photon energy is increased to 5hvo, then maximum velocity of photoelectrons will be ?

Question 11 of 15

12. The momentum of a photon of energy 1 MeV in kg m/s, will be ?

Question 12 of 15

13. In a photosensitive cell, with exciting wavelength λ the fastest electron has speed v. If the existing wavelength is changed to 3λ/4, the speed of the fastest emitted electron will be ?

Question 13 of 15

14. when ultraviolet rays are incident on metal plate, the photoelectric effect does not occur. It occurs by incidence of ?

Question 14 of 15

15. A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted 2 m, then ?

Question 15 of 15


 

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