Transcript
The force on an object due to gravity
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√√√
√Positive as it repelled the positive alpha particles
The force on an object due to gravity
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√√
√
for each half life multiply by ½
¼ = ½ x ½ = 2 half lives
2 half lives = 138 x 2 = 276 days
The force on an object due to gravity
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√√√
√
half life = time it takes the initial activity to halve.