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6. What is the main source of UV light?
A. Fluorescent light
C. Sun
B. Incandescent light
D. UV lamp
7. What form of EM wave is useful in diagnosing bone fracture and Tumors?
A. Gamma ray
C. Visible light
B. UV light
D. X-ray
8. Which EM wave is emitted by stars and some radioactive substances?
A. Gamma ray
C. Visible light
B. UV light
D. X-ray​