X PHYSICS
UNIT – V
ELECTROMAGNETIC SPECTRUM
1. A ______________ is a group of wave lengths or frequencies.
2. The invisible radiation before violet are called ______________ radiations. 3. ______________ radiations can be detected by thermopile.
4. The wave length of the microwaves are in the range ______________ to ______________.
5. ______________ are produced by the electro magnetic oscillators of low frequency. 6. _______ radiations are produced by the high energy transitions of the electrons in atoms. 7. Wave length of X-rays range from ______________ to ______________.
8. X-rays in continuous wavelengths can be produced when electrons are ______________.
9. X-rays of short wave length are also called as ______________.
10. X-rays are also used to cure some diseases. This method is called ______________.
11. ? rays are emitted in ______________.
12. All electromagnetic waves are ______________ in nature.
13. The visible spectrum is emitted when excited valence ______________ in atoms jump to their normal states.
14. Infrared radiations have wavelength from ______________.
15. IR means ______________.
16. Hot bodies form sources of the ______________ radiations.
17. The Ozone layer protects us from _____________ radiations from the Sun.
18. ______________ are used to take photographs of objects in darkness.
19. Microwaves are produced by high frequency electromagnetic _________ in electric circuits. 20. ______________ waves are used in satellite communications.
21. Radio wave lengths have wave lengths from____________ m to about____________ k.m.
22. Radio waves are produced by electromagnetic oscillations of ____________ frequency. 23. UV means ____________.
24. ____________ X-rays are used in radiography.
25. Bolometer is used for the detection of ____________.
26. The wave length range of visible spectrum is ____________.
27. Speed of light in vacuum is ____________.
28. RADAR means __________________.
29. _________ waves are produced by accelerated electrons in aerial circuits.
30. The type of radiations used in Radar are ____________.
UNIT – V
ELECTROMAGNETIC SPECTRUM (Key)
(1) spectrum (2) ultra-violet (3) infrared (4) 10µ. to 10m (5) Radio waves (6) ultraviolet (7) 0.001 nm, 10nm or 0.01?, 100? (8) decelerated (9) hard x – rays (10) radiotherapy (11) radioactivity (12) transverse (13) electrons (14) 0.7µm to 100µm (15) Infra red (16) Infra red (17) ultra-violet (18) IR radiations (19) Oscillators (20) micro (21) 1, 100 (22) low (23) Ultra Violet Spectrum (24) soft (25) Infra red rays (26) 0.4 µm - 10µm (27) 3×108 m/s (28) Radio Detection and Ranging (29) Radio (30) Microwaves.
