general science

GENERAL SCIENCE XI

RAYS AND WAVES

  1. Gamma rays are considered the death rays.
  2. Gamma rays travel with the velocity of light
  3. Gamma rays have maximum penetrating power
  4. Shortest wavelength among alpha, beta and gamma is of gamma rays
  5. Laser rays are used in micro surgery
  6. Alpha radiations produce burns on human body
  7. Newton proved that sunlight consists of different colors
  8. Beta rays are fast moving electrons.
  9. Color with shortest wavelength is Blue
  10. Violet have shortest wave length and Red has longest wavelength (vibgyor)
  11. Red light’s wave length is 11800 waves/cm (infra red)
  12. Least deviated color in prism is red
  13. Greatest deviated color in prism is indigo (Check violet)
  14. Violet light’s wave length is 23600 waves/cm (ultra violet)
  15. Ultraviolet rays are less than 3000 deg: A
  16. Greatest value of wavelength is of infra red
  17. Visible waves are between 400-700 nanometers.
  18. MOTE = Million Tons of oil equivalent
  19. REM = Roentgen equivalent in man
  20. Transverse waves can only be produced in solids
  21. Longitudinal waves can be produced in solids, liquids and gases
  22. On passing thought food stuff, x-ray can kill bacteria
  23. Violet color of light t ravel thought glass with minimum speed
  24. There is no wavelength of light for color brown.
  25. White light is a mixture of all the colors in the rainbow.
  26. Blue has the shortest wavelength and red the longest.
  27. Radio waves also come from sun and outer space. Astronomers use radio telescope to hear them.
  28. Radar uses microwaves.
  29. Anything that is warm produces infrared waves including us. The hotter the thing the more IR.
  30. Infrared waves are used in TV remote control.
  31. X-rays have shorter wavelength and more energy than ultraviolet rays.
  32. Gamma rays come from radioactive materials. They are used to kill cancers.
  33. Without exposure to ultraviolet light our bodies would not be able to make vitamin D.
  34. UHF, ultra high frequency are radio waves used for TV broadcast
  35. Microwaves are used in radar, mobile phones, microwave oven, communication network
  36. Each light color is of different wavelength.
  37. Red light has the longest wavelength while violet light has the shortest.
  38. Waves with a longer wavelength than red light are invisible they are called infrared waves.
  39. Invisible Ultraviolet wave have wavelength shorter than violet light.
  40. Red, Blue, Green are prime colors.
  41. Red + Blue + Green = white
  42. The wavelength of visible light is between 1350-2500
  43. An object that reflects all the light looks white.
  44. Loudspeaker converts electrical energy into sound energy.
  45. Light coloured clothes are generally worn in summer
  46. The electrical device which transform voltage: transformer
  47. A nuclear reaction in which two or more than two lighter nuclear are fused together to form a relatively heavier one: nuclear fusion
  48. The three colours combination which produces the sensation of white light: Red green and blue
  49. The clear sky looks blue because of dispersion of light
  50. When light waves travel from air to glass the wavelength and velocity variables are affected.
  51. Electrical lines of forces are imaginary.
  52. Frequency distinguishes ultrasound from normal audible sound. Its f > 20,000 Hz.

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