Multiple choice

Who invented cosmic rays?

  1. Macmillian

  2. Torricelli

  3. R.A.Millikan

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Robert A. Millikan is credited with the discovery and naming of cosmic rays in the 1920s through his groundbreaking balloon experiments. His work proved that these rays originated from outer space, not from Earth's atmosphere as previously thought. The term 'cosmic rays' was coined by Millikan himself. Macmillan and Torricelli are not associated with this discovery.

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