Exam 14: The Nucleus and Radioactivity: an New Force

At Chernobyl, one of the harmful radioactive isotopes was ¹³¹I, a beta emitter with a halflife of 8 days. Suppose some of this isotope is deposited on a field. What can we say about this field 40 days later?

Reasoning from the fact that it is difficult to pull a nucleus apart, we can conclude that the nuclear force must

How do the masses of the nuclei of ³ H and ³ He compare? 1 2

Regarding the question of the precise time at which a radioactive nucleus will decay:

What is the difference between ²³⁹Pu and ²⁴⁰Pu?

Radon has a 4- day half- life. Starting with 10 radon atoms, how many will remain after 4 days?

How does the mass of a ⁴ He nucleus compare with the mass of a ³ H nucleus? 2 1 A) ⁴ He is 4/3 times as massive, i.e., 33% more massive. B) They have about the same mass. C) ⁴ He is four times as massive. D) ⁴ He is twice as massive. E) ⁴ He is 3/2 times as massive, i.e., 50% more massive.

A common opinion concerning the creationism versus evolution controversy is the idea that Earth was created fairly recently but that it was created with fossils and other evidence of great age already present, so that Earth has the appearance of being very old even though it is really quite young. This opinion is best classified as

Of the four fundamental forces that act in the universe, which one supports a book that is at rest on a table?

If a radioactive isotope has a one year halflife, what fraction will remain after 5 years?

Which of the following is not one of the four fundamental forces in nature?

The isotope ²²⁶ Ra alpha decays to the daughter nucleus

The discoverer of radium was

One way in which the ionizing radiation occurring naturally in the environment has been beneficial to the human race is

¹²C and ¹³C differ in their

Marie Curie is famous for

The isotope ² H has