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Question:

Which constituent radiation of the electromagnetic spectrum is used (i) In RADAR, (ii) To photograph internal parts of a human body, and (iii) For taking photographs of the sky during night and foggy conditions?

Solution:

a) Radio waves (3×10⁹)
b) X-rays (3×10¹⁶ - 7×10¹⁷)
c) IR Radiations (3×10¹² - 8×10¹¹)