Radioactivity (10 of 16) Decay Activity, Example Problems

Goes over four different worked examples for calculating activity and half-life from radioactive decay. Activity is defined as the number of decays per second. It is abbreviated with the symbol A and has the metric unit the Becquerel (Bq). One Becquerel is equal to one decay per second.
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[@orakwuefablyn9221]

Best so far 100%

[@stepbystepscience]

Happy to hear that. Thanks for your comment!

[@Meinan4370]

This is awesome. The last question type took forever to find a solution for and glad you covered it!!!

[@stepbystepscience]

Glad it helped!

[@justinbanda2655]

Simple and interesting

[@stepbystepscience]

Thank you

[@dr.m4488]

Man good bless ❤️❤️❤️ you hlep a lot befor my exam

[@stepbystepscience]

Thanks, glad to hear that!

[@surienhughes7198]

Thank you, will finally be able to do these sums in my exam

[@stepbystepscience]

Glad to hear it. Best of luck!

[@noori6982]

What if at 7:00 you have that the half-life is 9.7 hr and it's asking you to find what amount remains in Bq after 12 hrs? Bc I was trying to follow you and did 12 hr/9.7 hr and got 1.23711 half-lives, which means that the Activity (in Bq) will be some # between the first and second half-life [T1/2 (1) and T1/2 (2)], how do you find that exact # (the Activity)?

[@stepbystepscience]

I think I went over that in the video.

[@chineduobodoeshike8816]

You are the best, please make a video in binding energy

[@stepbystepscience]

I have a whole playlist for mass defect and binding energy, here is the link to the first video, let me know what you think, kzbin.info/www/bejne/p4q4hZydhd11bKM

[@THEDragonTechnoGamer]

Bruh ! U have to come here to Japan, there's no teacher who put this type of questions in the exam, our physic is just math

[@stepbystepscience]

I'd love to come to Japan!

[@visalnip7789]

Thank you so much! This helped greatly.

[@stepbystepscience]

You're welcome! Glad it helped.

[@paulmcgarry7745]

Brilliant explanation, really impressed. So what about - I have 370MBq of I-125 on 23 Mar - How much did I have on 16th of Mar ??? Can you help please

[@orevairioke8525]

Great

[@vartikamishra2578]

Thanks a lot🥰

[@stepbystepscience]

You’re welcome 😊

[@JorDANKa007]

where did (10^-1) come from in the last example ?

[@stepbystepscience]

ln (330/400) = -0.19237 which in the video I wrote as -1.92 x 10^-1. They are equivalent. Does that help?

[@JorDANKa007]

Oh! Right, ok, that does help. However, I'm still having a hard time figuring out how to simplify the last 2 steps. My train of thought tells me to take [(-1.92x10^-1) x -1.39 ] to isolate half life, but this does not equal 7.20. I must be missing a step.

[@renishadsouza3645]

what is the activity of cobalt 60 after 8 years,if the present activity is 100 curie

[@shannenedmilao9664]

Please make videos about center of mass of point particles and for infinitesimal ...

[@КирилСтефановЗлатарски]

what will be the activity of elemnet of a=625mci h.l = 8 days after 20 days becouse i get different result from online calculator of activity

[@soweitwegvonperfection7150]

Thank you so mutch :)

[@stepbystepscience]

You're welcome!

[@blendedtime8162]

cheers

[@stepbystepscience]

Thanks, to you too!

[@draboodo9838]

Rely think you

[@stepbystepscience]

Most welcome!

[@talibnazary979]

Slow the fuck down son.