the half life of Tl-201 is 73.1 hours. what's the decay constant?
Solution)
Given,
Half life, T=73.1 hrs=263160 s
Decay constant, lambda=?
We know,
T=0.693/lambda
So, lambda=0.693/263160 s= 2.63*10^-6 s^-1 (Ans)
==============
A sample of Tl−201 has an initial decay rate of 5.90×104 /s . A. How long will it take for the decay rate to fall to 347 /s ? (Tl−201 has a half-life of 3.042 days.)
The half-life of Thorium-231 is 25.5 hours. What is the rate constant of this decay?
The isotope 208^Tl undergoes β decay with a half-life of 3.1 min. (a) What isotope is produced by the decay? (b) How long will it take for 99.0% of a sample of pure 208Tl to decay? (c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?
1. a certain isotope has a half life of 24.3 minutes. what is the decay constant (in s^-1) of this isotope? 2. You are told that a room contains an isotope with a half-life of 1.5 hours. If you need to wait until the isotope has decayed to 15% of its initial activity before entering the room, how long (in hours) must you wait
Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9 hours. If you begin with 33.2 mg of this isotope, what mass remains after 135 hours have passed? mg
The decay constant of a given nucleus is 4.9×10?5 s?1 . What is its half-life? Answer is in hours.
How long will it take a sample of molybdenum-99 (half-life 67 hours) to decay to 25% of its original activity?
An isotope has a half-life of 20.37 days. What is its decay constant in units of s-1?
The half-life of a certain radioactive element is 48.0 hr. a) Determine the decay constant in s^-1. b) If we started with 100.0 grams of this element, how much would be present in grams after 20.0 days? Work this out using the exponential decay formula.
CH 20 Half-Lives Question What is the half-life of ;, in days, if its decay constant is 9.94 x 10-75-11 Select the correct answer below: O 10.1 days O 8.07 days O 6.90 x 105 days 02.84 days