GATE GG-1 · 2019 · PART-B SECTION-1
Question 55: Geological time scale
Give it a try, then reveal the answer to check your work.
Question 55
PART-B SECTION-1NAT2 marksNeeds review
⁸⁷Rb decays to ⁸⁷Sr with a decay constant λ = 1.42 × 10⁻¹¹ per year. If at the time of formation, a system contains 8 × 10⁴ atoms of ⁸⁷Rb and 10³ atoms of ⁸⁷Sr, the number of ⁸⁷Sr atoms in this system at the end of 4 half-lives will be ________ × 10³. Assume close system evolution for parent-daughter pair.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerEXPLORE & PRACTISE
Paper and topic context
See where this question comes from and choose what to practise next.
2019PART-B SECTION-1
GATE GG-1 2019 · Paper 1
Geology and Geophysics · Original paper archive
- Section
- Section PART-B SECTION-1
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
Practise related topics
Explore more previous year questions using this question’s imported topic tags.
geology
GATE GG-1 previous year questions
earth science
GATE GG-1 previous year questions
geoscience
GATE GG-1 previous year questions
geological time scale
GATE GG-1 previous year questions
Comments
Ask a question, share your approach, or help someone understand.
Log in to view the discussion
You’re not logged in. Log in or create an account to see discussions and add comments.