Physics Atomic Spectra Test Online Preparation Mcqs

Physics Atomic Spectra Test Online Preparation Mcqs With Answers Start Below

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Question 1 of 15

1. The velocity of laser light is ______.

A. More than ordinary light

B. Less than ordinary light

C. Different for different colours of frequency

D. Equal to ordinary light

Question 1 of 15

Question 2 of 15

2. In excited state the total energy is E, what is K.E. with proper sign

A. -E/2

B. 2/E

C. -E

D. 2E

Question 2 of 15

Question 3 of 15

3. The radiations emitted from hydrogen filled discharged tube show

A. Continuous spectrum

B. Band spectrum

C. Absorption spectrum

D. Line spectrum

Question 3 of 15

Question 4 of 15

4. In an X-ray tube, electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is _______.

A. he/Vc

B. Impossible to predict

C. eV/h

D. hc/eV

Question 4 of 15

Question 5 of 15

5. X-rays are similar in nature to _______.

A. Cathode rays

B. α-rays

C. Positive rays

D. γ-rays

Question 5 of 15

Question 6 of 15

6. X-rays are diffracted by a crystal but not by a diffraction grating because ______.

A. The lines in a diffraction grating cannot reflect x-rays

B. The wavelength of X-rays are of the same order of magnitude as the separation between atoms in a crystal

C. The penetration power of x-rays is high in a diffraction granting

D. The ions in a crystal are well arranged

Question 6 of 15

Question 7 of 15

7. A Balmer line is emitted when the electron in a hydrogen atom jumps from

A. The first orbit to a higher orbit

B. A higher orbit to the first orbit

C. The second orbit to a higher orbit

D. A higher orbit to the second orbit

Question 7 of 15

Question 8 of 15

8. Excited atoms return to their ground state in ________.

A. 10-10s

B. 10-9s

C. 10-8s

D. 10-6s

Question 8 of 15

Question 9 of 15

9. What is the velocity of a particle of mass m & de-Broglie wavelength λ?

A. (2hc/mλ)1/2

B. 2h/mλ

C. h/mλ

D. mh/λ

Question 9 of 15

Question 10 of 15

10. In an electronic transition, atom cannot emit _____

A. γ-rays

B. Visible light

C. Ultra violet rays

D. Infra red radiations

Question 10 of 15

Question 11 of 15

11. Which one of the following postulate is in accordance with the Rutherford’s model?

A. Discrete spectra for atoms

B. Continuous spectra for atoms

C. No spectrum

D. Either continuous nor discrete

Question 11 of 15

Question 12 of 15

12. In normal state of energy, the incident high energy photons will be

A. Cause X-ray emission

B. Absorbed

C. Cause laser production

D. Stimulated

Question 12 of 15

Question 13 of 15

13. X-rays are _________

A. high energy photons

B. of unknown nature

C. radio isotopes

D. high energy electrons

Question 13 of 15

Question 14 of 15

14. The metastable state for an atom in laser light is

A. 10-4sec

B. 10-5sec

C. 10-3sec

D. 10-8sec

Question 14 of 15

Question 15 of 15

15. Reverse process of photoelectric effect is

A. Annihilation of matter

B. Compton effect

C. x-rays production

D. Pair production

Question 15 of 15

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Physics Atomic Spectra Test Online Preparation Mcqs

Physics Atomic Spectra Test Online Preparation Mcqs With Answers Start Below

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