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Spectroscopy

13. 

Electromagnetic radiations are given our due to

A. jumping of electrons from low energy level to higher level B. jumping of electrons from high energy level to low level C. revolution of electrons in specified orbits D. None of these

Answer : D. None of these

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14. 

Polarids are used in

A. photo electric effect B. photo-elasticity C. Photo-electric cell D. Photosynthesis

Answer : B. photo-elasticity

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15. 

Consider the statements:
X -rays
I. are not electromagnetic radiations
II. Are electromagnetic radiations
III. Have longer wave lengths
IV. Have shorter wave lengths of these points

A. I and III are correct B. I and IV are correct C. II and IV are correct D. II and III are correct

Answer : C. II and IV are correct

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16. 

Consider the following statements: Radioactive substances emit
I. Alpha rays
II. Beta rays
III. X-rays rays
IV. Gamma rays

A. I and II are correct B. I,II and III are correct C. I,II and IV are correct D. All are correct

Answer : C. I,II and IV are correct

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17. 

X-rays cannot penetrate through

A. wood B. aluminium C. lead D. iron

Answer : C. lead

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18. 

The transverse wave nature of light was proved by

A. Interference B. Diffraction C. Polarisation D. Refraction

Answer : C. Polarisation

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