CBSE Physics Electrons and Photons Test 1 Online
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CBSE Physics Electrons and Photons Test 1 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. Physics board exam paper held subject wise as regular basis. Our topics is Electrons and Photons syllabus for preparation. All students get best formed questions answers test take online for get best rank score in examinations.

CBSE Physics Electrons and Photons Test 1 Online

CBSE

1. Kinetic energy of an electron which is accelerated in a potential difference of 100 V is ?

Question 1 of 15

2. A radio transmitter operates at a frequency 880 kHz and a power of 10 KW. The number of photons emitted per second is ?

Question 2 of 15

3. Ultraviolet radiation of 6.2eV falls on an aluminum surface. KE of fastest electron emitted is (work function = 4.2 eV) ?

Question 3 of 15

4. Which of the following is true ?

Question 4 of 15

5. In photoelectric effect, the work function of a metal is 3.5 eV. The emitted electrons can be stopped by applying a potential of -1.2 V. Then ?

Question 5 of 15

6. Which of the following are thermions ?

Question 6 of 15

7. The 21 cm radiowave emitted by hydrogen is interstellar space is due to the interaction called the hyperfine in atomic hydrogen. The energy of the emitted wave is nearly ?

Question 7 of 15

8. When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission, what is the ratio of the work functions of the two emitters ?

Question 8 of 15

9. Doubly ionised helium atoms and hydrogen ions are accelerated from rest through the same potential drop. The ratio of the final velocities of the helium and the hydrogen ion is ?

Question 9 of 15

10. The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2 > W1). If the current before and after changes are l1 andl2, all other conditions remaining unchanged, then (assuming hv > W2) ?

Question 10 of 15

11. The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 5000 A°. Its work function is ?

Question 11 of 15

12. The dE-Broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it ?

Question 12 of 15

13. The wavelength of a 1 KeV photon is 1.24 x 10-9m. What is the frequency of 1 MeV photon ?

Question 13 of 15

14. The energy of a photon of wavelength λ is ?

Question 14 of 15

15. Photoelectric work function of a metal is 1 eV, light of wavelength λ= 3000 A° falls on it. The photoelectrons come out with velocity ?

Question 15 of 15


 

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