Question

Half life of a radioactive substance is 20 days what percentage of a sample will decay in 10 days

Answer 1

Hey mate!!
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→ Your answer is 29%

★ Apply formula,

The amount of radioactive mat3rial that remains after time t

A(t) = A° × 2^(-t/t.half)

where, A° is initial amount of radioactive material.

let A° =100

now, after time t

A(t) = 100 × 2(-10/20)

→ A(t) = 100 × 2^-1/2

→ A(t) = 100 × 0.707

→ A(t) = 71%

i.e REMANING = 71%

DECAYED = (100 - 71)= 29%

Hope it helps!!

#Jaihind