Apparent frequency change depends on relative velocity between source and observer with respect to medium. Both motions contribute: f' = f(v±v_o)/(v∓v_s). Memory tip: 'Approaching ⇒ higher pitch; receding ⇒ lower pitch'. Conceptual question testing Doppler effect fundamentals, frequently examined in competitive exams.
Explanation:
Henri Becquerel discovered natural radioactivity in 1896 from uranium salts. Marie and Pierre Curie later discovered radium and polonium. Rutherford classified alpha, beta rays. Roentgen discovered X-rays.
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