51. Coolis tube is used to produce
52. Who among the following discovered X-rays?
53. Ozone layer in the outer atmosphere helps us in
54. The waves used in sonography are
55. In the remote control of television, electromagnetic waves used are
56. Which one of the following is not a property of electromagnetic waves?
57. Which one of the waves have the longest wavelength
58. Remote-sensing device has an inbuilt source of
59. Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
60. Which of the following has the shortest wavelength?
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