MCQOPTIONS
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| 1. |
Electromagnetic spectrum contains : |
| A. | gamma rays (wave length < 10^-10 m) |
| B. | ultraviolet rays (wave length < 10^-6 m) |
| C. | infrared rays (wave length < 10^-4 m) |
| D. | All of these |
| Answer» E. | |