Hey there! Sign in to join this conversationNew here? Join for free
Turn on thread page Beta
    • Thread Starter
    Offline

    8
    ReputationRep:
    If 45% of the unstable nuclei in a sample take 50s to decay, calculate the decay constant in s−1.

    need an explanation on how to do it!

    Josh
    • Thread Starter
    Offline

    8
    ReputationRep:
    bumo
    Offline

    17
    ReputationRep:
    N=N0e^(-lambda*t)

    45% of nuclei decay so number of nuclei remaining, N=0.55N0.

    0.55N0=N0e^(-lamda*50)

    Rearrange and solve for lambda.

    Let me know if the formatting is any good.

    Hope that helped. If not let me know.
    Posted on the TSR App. Download from Apple or Google Play
    Offline

    11
    ReputationRep:
    You can use the equation: 𝑁 = 𝑁oe−𝜆t but since it says 45% of the nuclei have decayed then N/No = 0.45
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: March 13, 2018
Poll
“Yanny” or “Laurel”

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.