Half-life is measured by
A. Geiger-Muller counter
B. Carbon-dating
C. Spectroscopic method
D. Wilson-cloud chamber
Answer: Option B
A. Geiger-Muller counter
B. Carbon-dating
C. Spectroscopic method
D. Wilson-cloud chamber
Answer: Option B
. . . . . . . . invented Atom Bomb.
A. J Robert Oppenheimer
B. John Bau a Ning
C. Samuel Cohan
D. Samuel Colt
A. when low speed electrons is ejected
B. when high speed electron is obstructed by a metal surface
C. when anode-ray obstructed by a solid object
D. when γ-ray is obstructed by a solid object
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