Chapter 33 Quiz

An element will decay to an element with higher atomic number in the periodic table if it emits a. a beta particle b. an alpha particle c. a gamma ray d. a proton beam

A. a beta particle

When radium (A=88) emits an alpha particle, the resulting nucleus has atomic number a. 86 b. 88 c. 90 d. 92

A. 86

There is a greater proportion of carbon 14 in a. new bones b. old bones c. same in each

A. new bones

The atomic number of an element is the same as the number of its a. protons b. neutrons c. nucleons d. none of the above

A. protons

Which of the following isotopes is radioactive? a. Carbon-12 b. Carbon-14 c. both d. neither

B. Carbon-14

When a beta particle is ejected from a nucleus, the nucleus than has a greater a. mass b. charge c. both d. neither

B. charge

Electric forces within an atomic nucleus tend to a. hold it together b. push it apart c. have no efffect

B. push it apart

The half-life of an isotope is one day. At the end of two days the amount that remains is a. none b. 1/2 c. 1/4 d. 1/8

C. 1/4

Which body is heated in its interior by nuclear processes? a. Sun b. Earth c. Both d. Neither

C. Both

An atom with an imbalance of electrons to protons is a. a hadron b. a baryon c. an ion d. an isotope

C. an ion

When an alpha particle is ejected from a nucleus, the nucleus then has less a. mass b. charge c. both d. neither

C. both

Deuterium and tritium are both a. forms of hydrogen b. isotopes of the same element c. both of these d. none of these

C. both of these

When a nucleus emits a beta particle is atomic number a. remains constant, but its mass number changes b. remains constant, and so does its mass number c. changes, but its mass number remains constant d. changes, and so does its mass number

C. changes, but its mass number remains constant

X-rays are similar to a. alpha rays b. beta rays c. gamma rays d. all of the above

C. gamma rays

The phenomenon that can be explained only in terms of the particle model of light is a. reflection b. refraction c. photoelectric effect d. diffraction

C. photoelectric effect

The source of Earth's natural heat is a. molten-hot lava b. pressure on the Earth's core c. radioactive decay in the Earth's core d. solar energy in the form of fossil fuels

C. radioactive decay in the Earth's core

The half-life of an isotope is one day. At the end of three days, how much of the isotope remains? a. none b. 1/2 c. 1/4 d. 1/8

D. 1/8

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. Eight hours later, the counter registers 10 counts per second. What is the half-life of the isotope? a. 8 hours b. 6 hours c. 4 hours d. 2 hours

D. 2 hours

A nucleon is either a. a positron or an electron b. a proton or an electron c. a neutron or an electron d. a proton or a neutron

D. a proton or a neutron

Different isotopes of an element have different numbers of a. protons b. hadrons c. photons d. neutrons

D. neutrons