Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    can sum1 do this question i really don't understand it:

    the idea of half- life can be used to find the age of the rock.

    radioactive uranium is trapped in a rock when rock is formed.
    the uranium decays to non- radio active lead.
    the half-life of uranium is 4500million years.

    explain how you can find the age of the rock. (4)
    Offline

    12
    ReputationRep:
    (Original post by starcrossed)
    can sum1 do this question i really don't understand it:

    the idea of half- life can be used to find the age of the rock.

    radioactive uranium is trapped in a rock when rock is formed.
    the uranium decays to non- radio active lead.
    the half-life of uranium is 4500million years.

    explain how you can find the age of the rock. (4)
    the half life of an object is the time taken for the radioactivity to halve. if you know the half life, you can work out the age of the rock by measuring the radioactivity, then working out how long it must have taken for the rock to decrease in radioactivity to its current level.
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by allisandro)
    the half life of an object is the time taken for the radioactivity to halve. if you know the half life, you can work out the age of the rock by measuring the radioactivity, then working out how long it must have taken for the rock to decrease in radioactivity to its current level.
    thanks, i think i understand it now.
    • Thread Starter
    Offline

    0
    ReputationRep:
    has ne1 else got any ways they would answer this question?
 
 
 

University open days

  1. University of Edinburgh
    All Departments Undergraduate
    Sat, 22 Sep '18
  2. University of Exeter
    Undergraduate Open Days - Penryn Campus Undergraduate
    Sat, 22 Sep '18
  3. Loughborough University
    General Open Day Undergraduate
    Sat, 22 Sep '18
Poll
Which accompaniment is best?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.