QUESTION 10discovered radium and spent many years collecting a fraction of a gram of substance in order to study itsproperties.O J.J.ThompsonН. ВесqиerelMarie CurieErnst Rutherford

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Answered: discovered radium and spent many years…

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter10: Nuclear Physics

Section: Chapter Questions

Problem 10.4CYU: Check Your Understanding In radioactive beta decay, does the atomic mass number, A, increase or...

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Data from the appendices and the periodic table may be needed for these problems. Natural uranium is 0.7200% 235U and 99.27% 238U. What were the percentages of 235U and 238U in natural uranium when Earth formed 4.5109 years age?
Check Your Understanding In radioactive beta decay, does the atomic mass number, A, increase or decrease?
Data from the appendices and the periodic table may be needed for these problems. (a) Natural potassium contains 40K, which has a halflife of 1.277109y. What mass of 40K in a person would have a decay rate of 4140 Bq? (b) What is the fraction of 40K in natural potassium, given that the person has 140 g in his body? (These numbers are typical for a 70kg adult.)
The atomic weight of cadmium is 112.41, and its density is 8.65 g/cm3. Using Figure 14.3, estimate the attenuation distance of a thermal neutron beam in cadmium. (The attenuation distance is the distance traveled after which the intensity of the beam is reduced to 1/e of its initial value, where e is the base of the natural logarithms.)
Data from the appendices and the periodic table may be needed for these problems. 53. You can sometimes find deep red crystal vases in antique stores, called uranium glass because their color was produced by doping the glass with uranium. Look up the natural isotopes of uranium and their halflives, and calculate the activity of such a vase assuming it has 2.00 g of uranium in it. Neglect the activity of any daughter nuclides.
Isotopes that emit (radiation are relatively safe outside the body and exceptionally hazardous inside. Yet those that emit (radiation are hazardous outside and inside. Explain why.
The ruins of the Chernobyl reactor are enclosed in a huge concrete structure built around it after the accident. Some rain penetrates the building in winter, and radioactivity from the building increases. What does this imply is happening inside?
Data from the appendices and the periodic table may be needed for these problems. A 5000Ci 60Co source used for cancer therapy is considered too weak to be useful when its activity falls to 3500 Ci. How long after its manufacture does this happen?
Data from the appendices and the periodic table may be needed for these problems. 59. World War II aircraft had instruments with glowing radiumpainted dials (see Figure 31.2). The activity of one such instrument was 1.0105Bq when new. (a) What mass of 226Ra 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?

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discovered radium and spent many years collecting a fraction of a gram of substance in order to study its roperties. O J.J.Thompson Юн. Весqиerel O Marie Curie O Ernst Rutherford