A radioactive nucleus has a half-life of 20 years, starting with 100,000 particles, how many particles will be left exactly at the end of 40 years

a

75,000 particles

b

35,000 particles

c

25,000 particles

d

50,000 particles

Download Offline App Ask a Question

Explanation

Correct Option
c

Video Explanation

Post your Contribution

Share:

Discussions (6)

Wawaaaaaaaaaaaqa
2 years ago
Image

Emmanuel24458
3 years ago

n=t/T
Where T halflife
t time
n no of half-life
40/20=2
2n
2×2=4
100000/4

Swali
3 years ago

Any comments?
😀

MhizDee430
1 year ago

Easy formula
Residual mass=Original mass/2

Quick Questions

Ask a Question
CO

ceoofwahala

20th June, 2026

Chemistry


2 comments

ASSAAS

20th June, 2026

English Language


5 comments

infinitehoaxx

21st May, 2026

Computer


4 comments