Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

Get the answer to your homework problem.

Try Numerade free for 7 days

Like

Report

World War I aircraft had instruments with glowing radium- painted dials (see Figure 31.2$)$ . The activity of one such instrument was $1.0 \times 10^{5}$ Bq when new. (a) What mass of $^{226}\mathrm{Ra}$ was present? (b) After some years, the phosphors on the dials deteriorated chemically, but the radium did not escape. What is the activity of this instrument 57. 0 years after it was made?

a) 2.73$\mu \mathrm{g}$b) $R=9.76 \times 10^{4} \mathrm{Bq}$

Physics 103

Chapter 31

Radioactivity and Nuclear Physics

Nuclear Physics

Cornell University

University of Washington

Simon Fraser University

McMaster University

Lectures

02:51

In physics, wave optics is…

10:02

Interference is a phenomen…

02:05

World War II aircraft had …

02:55

During World War II, triti…

02:43

03:41

A sample of the radioactiv…

01:57

The curie (Ci) is a common…

05:07

$\mathrm{A}^{60} \mathrm{C…

02:15

01:44

In $1992,$ Swiss police ar…

05:06

There is more than one iso…

08:27

A by-product of some fissi…

02:12

The activity of a sample o…

06:42

Smoke Detectors Americium-…

01:52

Consider the fission of ur…

04:44

Radioactive tracers. Radio…

03:00

43.24. Radioactive Tracers…

00:41

A radioactive sample inten…

01:15

What led Marie Curie to dr…

03:46

(a) The first nuclear tran…

02:13

$\textbf{Radioactive Trace…

02:28

The isotope $^{226} \mathr…

we know that more than most of radium Ah Moeller Moss of radium radium It's equal to 226 point 0 to 5 grams and half life of radium. Half life of radium Hard life off radium is 1.60 Multiply by 10 to the power three years, 20 years and activity is given activity A is equal to 1.0 multiply by 10 to the power five vehicles We know no little party. We know that activity gain equals 0.693 multiply by and divided by half life, half life and n equals. It will get his number divided by Mother moss Multiply by M and M is the muscle figure in sample and therefore activity A is equal to 0.693 multiply by. Uh, it will get this number divided by Muller Moss multiplied by m divided by half life, half life and scolding For a we have, uh a is equal to 0.69 tree multiply by. It will get his number most of life. I m divided by Moeller Marce multiply by half life. No, let's song for him. All right, now we substitute values. M equals. Mmm. Well, A is 1.0 multiplied by 10 to the power five multiplied by Mother Moss in kilograms is zero point. Do do 60 two multiply by half life, would you, sir? 1.60 multiplied by 10 to the power three years. Let's go inward in two seconds and therefore we multiply with 3.15 Multiply by 10 to the power seven seconds divided by divided by a 0.693 Multiply by, um, and we'll get those numbers. Explains it to multiply by 10 to the power 23. All right, so m equals zero point to seven multiplied by 10 to the power minus eight kilograms. And this can be returnees. Uh, 2.7 micro grams. Now let's sold part B. We know that a equals and not times e to the parlor. Um, minus lambda t. And this can be returnees. Yeah, and not times e to the dollar minus zero point zero point, uh six, 93 divided by half Life multiply by t and therefore a equals and not is 1.0 multiplied by 10 to the power five multiply by e to the power minus 0.693 multiplied by 57. Time is 57 years and divided by half, life 1.6 feet or motive live. I tend to the power three years and therefore we have one point. Siegel multiply by tended our five times e to the power minus zero point A minus 0.24 and therefore a equals zero point. My neat multiply by 10 to the power five and this equals nine point eat multiply by tend to the bone for be girls.

View More Answers From This Book

Find Another Textbook

In physics, wave optics is the study of the behavior of light, or other elec…

Interference is a phenomenon in which two waves superpose to form a resultan…

World War II aircraft had instruments with glowing radium-painted dials. The…

During World War II, tritium $\left(^{3} \mathrm{H}\right)$ was a component …

During World War II, tritium ( $^{3} \mathrm{H} )$ was a component of fluore…

A sample of the radioactive nuclide $^{199} \mathrm{Pt}$ is prepared that ha…

The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: …

$\mathrm{A}^{60} \mathrm{Co}$ source is labeled $4.00 \mathrm{mCi},$ but its…

In $1992,$ Swiss police arrested two men who were attempting to smuggle osmi…

There is more than one isotope of natural uranium. If a researcher isolates …

A by-product of some fission reactors is the isotope $_{94}^{299} \mathrm{Pu…

The activity of a sample of the cesium isotope $^{137} \mathrm{Cs}$, with a …

Smoke Detectors Americium-241 $(t_{1 / 2}=433$ yr) is used in smoke detector…

Consider the fission of uranium- 235 .a. The fission of uranium- 235 beg…

Radioactive tracers. Radioactive isotopes are often intro- duced into the bo…

43.24. Radioactive Tracers. Radioactive isotopes are often introduced into t…

A radioactive sample intended for irradiation of a hospital patient is prepa…

What led Marie Curie to draw the following conclusions? (a) Radioactivit…

(a) The first nuclear transmutation was achieved in 1919 by Rutherford, who …

$\textbf{Radioactive Tracers}$. Radioactive isotopes are often introduced in…

The isotope $^{226} \mathrm{Ra}$ undergoes $\alpha$ decay with a half-life o…

01:22

After two time constants, what percentage of the final voltage, emf, is on a…

07:24

Armor-piercing shells with depleted uranium cores are fired by aircraft at t…

00:48

Find the radius of a 238 $\mathrm{Pu}$ nucleus. $^{238} \mathrm{Pu}$ is a ma…

03:21

(a) Calculate BE/A for $^{12}\mathrm{C}$ . Stable and relatively tightly bou…

02:40

$^{209} \mathrm{Bi}$ is the heaviest stable nuclide, and its $\mathrm{BE} / …

01:20

The 3.20-km-long SLAC produces a beam of 50.0 -GeV electrons. If there are $…

04:27

Confirm that charge, electron family number, and the total number of nucleon…

03:35

The $\beta^{-}$ particles emitted in the decay of $^{3} \mathrm{H}$ (tritium…

05:28

Consider the generation of electricity by a radioactive isotope in a space p…