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(a) Calculate the activity $R$ in curies of 1.00 g of $^{226} \mathrm{Ra}$ (b) Discuss why your answer is not exactly 1.00 Ci, given that the curie was originally supposed to be exactly the activity of a gram of radium.

a) 0.989 $\mathrm{Ci}$b) Earlier the activity of the 226 $\mathrm{Ra}$ was not known accurately and it is known more accurately now.

Physics 103

Chapter 31

Radioactivity and Nuclear Physics

Nuclear Physics

Cornell University

Hope College

University of Winnipeg

McMaster University

Lectures

02:26

In physics, nuclear physic…

08:29

In physics, nuclear proper…

02:25

Calculate the activity $R,…

02:57

To see why one curie of ac…

04:50

Calculate the activity of …

01:57

The curie (Ci) is a common…

03:09

Find the mass of $^{239} \…

01:28

A radiation detector recor…

02:15

02:28

The isotope $^{226} \mathr…

02:19

A nuclear physicist finds …

02:00

Calculate After 2.00 y, 1.…

07:46

If exactly $1.00 \mu \math…

03:43

Natural gold has only one …

06:19

The activity of a radioact…

10:05

Consider a 1.00 -kg sample…

07:11

(a) Calculate the energy r…

03:54

43.28. The isotope $^{24} …

01:13

Radium is a radioactive el…

03:20

The results of activity me…

00:47

Suppose that the amount, i…

01:39

A radioactive isotope has …

but a off the problem. We were asked to find activity off the radio. That is our is goon is reported. Six, um, 93 10. And it is the number of eight toes. You write it by half a life off the radio, so we'll find a number of items. Number of items is given by the given mass derided by the molar mass, which is 2 to 6. Well, the mask multiply by day. I got it was number. Okay, this gives us the number of items is 2.66 46 constant in power 21 a Tums. So we, uh, this much off items I will pluck this will you appear? And I want to fly with 0.6 and divided by the half life of radium, which is 1.6 times 10 to the power of three years, three years and the writing this value, so will come here. Uh, the activity will be, um, 3.66 times 10 to the power 10 Beckles and converting into units. These back rules will be cool too equal to zero point lying it. It's Curie curie. But be, uh, the half life or for radio oflife off radio are are a medium is more equitably known than it was when the Curie unit was established. So this was the reason End off the problem. Thank you for watching.

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