81. What is the wavelength of visible spectrum ?
82. Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?
83. Where are mesons found ?
84. Who discovered X-ray?
85. Which of the following has the lowest frequency?
86. Which of the following is not true about X-rays?
87. X–rays are
88. X-rays region lies between
89. In the absence of ozone layer, which rays will enter into atmosphere?
90. In MRI machine, which one of the following is used?
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