Atoms and Nuclei-Half Life and Mean Life (AIIMS Physics): Questions 7 - 8 of 8

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Question number: 7

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2002

MCQ▾

Question

A sample of radioactive element is containing 4×1015 active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days –

[AIPMT]

Choices

Choice (4) Response
a.

2 x 1015

b.

3.5 x 1015

c.

0.5 x 1015

d.

1 x 1015

Question number: 8

» Atoms and Nuclei » Half Life and Mean Life

Appeared in Year: 2004

MCQ▾

Question

The half – life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain un – decayed after – [AIPMT]

Choices

Choice (4) Response
a.

3200 years

b.

2400 years

c.

4800 years

d.

6400 years

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