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)