Physics Refraction – PDF Material for SSC & RRB Exams

Physics Refraction - PDF Material for SSC & RRB Exams

 

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1. Refraction is the bending of light when it goes from one medium to another.

2. When a ray of light enters the glass prism it gets deviated two times.

3. When the ray of light passes through the prism it bends towards its base.

4. In 1665, Isaac Newton discovered that white light consists of seven colours.

5. When white light is passed through glass prism then it will split in to seven colours.

6. The band of seven colours formed when a beam of white light is passes through a glass prism is called spectrum of white light.

7. The splitting of white light into seven colours on passing through a transparent medium is called dispersion of light.

8. While passing through the transparent medium, red colour deviates least and violet colour is deviated maximum

9. A rainbow is a meteorological phenom interesting facts about light and scattering enon that is caused by reflection, refraction and dispersion of light in water droplets.

10. Stars twinkle at night because their light is refracted in the atmosphere.

11. As the star light falls down the dense air bends it more and thus stars appear higher than they actually are.

12. It is due to refraction of light that we can see the sun two minutes before sunrise and two minutes after actual sunset.

13. Throwing light in various random directions on various types of suspended particles is called scattering of light.

14. When light is scattered due to particles in its path, it is called Tyndall effect.

15. The way a beam of sunlight becomes visible when it passes through dust particles in a room is due to Tyndall effect.

16. Sky is blue is because of scattering of light.

17. Sun appears red at sunrise and sunset because of all the blue coloured light is scattered out.

18. If our Earth did not have an atmosphere, the sky would be black like outer space.

19. Sound travels through a medium. It cannot travel in vacuum.

20. Larger the amplitude of the sound, louder is the sound.

21. Higher the frequency of vibration, the higher is the pitch, and shriller is the sound.

22. Unpleasant sounds are called

23. Sound is transmitted through gases, plasma, and liquids as longitudinal waves.

24. In solids sound can be transmitted as both longitudinal waves and transverse waves.

25. Loudness of sound is measured in units of decibel(dB).

26. The audible range of sound for human beings extends from about 20Hz to 20,000 Hz

27. Sounds of frequencies below 20 Hz are called infrasonic sound or infrasound.

28. The number of vibrations per second is called

29. The SI unit of audio frequency is the hertz (Hz).

30. Ultrasonic is a reference to the frequency of sound waves beyond (above) the human hearing range.

31. Ultrasound is produced by

32. ultrasound is commonly used for medical diagnosis and therapy, and also as a surgical tool.

33. Some bats and porpoises are found to use ultrasound for navigation and to locate food in darkness. – Echolocation

34. SONAR means Sound Navigation Ranging.

35. Supersonic is an adjective that describes the speed of something moving faster than sound.

36. Mach : the ratio of the speed of a body to the speed of sound in the surrounding medium.

37. When sound waves strike a surface, they return into the same medium. This phenomenon is called reflection.

38. Phenomenon of hearing back our own sound is called an

39. The minimum distance between the source of sound and the reflecting body should be2 metres for formation of echo.

40. Persistence of sound after its production is stopped, is called

41. In dry air at 0°C (32°F), the speed of sound is 2 metres per second.

42. At 20°C (68°F), the speed of sound is 343 metres per second.

43. Sound usually travels more slowly with greater altitude, due to reduced temperature.

44. Speed of sound increases with increase in temperature.

45. The study of sound is called

46. Optics is the study of light.

47. Phonetics is the study and classification of speech sounds.

48. Cat acoustics’ is the study of echoes.

49. Sound travels slower through air than by water. In fact, the speed of sound via water is 3 times faster than by air.

50. Sound does travel far faster through steel than both air and water.

51. Flies are not able to hear any sounds at all.

52. The fear of music is called

53. Phonophobia, also called Ligyrophobia or Sinophobia, is a fear of or aversion to loud

54. Heliophobia is the fear of the sun, sunlight, or any bright light.

55. Photophobia is not a morbid fear or phobia, is a common symptom of visual snow.

56. Brilliance in a diamond is due to total internal reflection, refraction and dispersion.

57. A blue iris in an eye is due to Willis-Tyndall scattering in a translucent layer in the iris.

58. The SI unit of luminous intensity is the candela (cd)

59. Our eyes detect light in ROYGBIV, rainbow colour form.

60. Objects that produce their own light are called Luminous objects.

61. To an astronaut in space, the sky will appear to be

62. Golden view of sea shell is due to

63. Mirage is an example refraction and total internal reflection of light.

64. Optical fibres are based on the phenomenon of total internal reflection.

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