TEST: ATOMIC AND NUCLEAR PHYSICS

After two hours, 1/16 of the initial amount of a certain radioactive isotope remains undecayed. The half-life of the isotope is: 45 minutes 60 minutes 15 minutes 30 minutes

30 minutes

Place the correct number in each position, indicating the number of subatomic particles in each position for a zinc atom(Z = 30, A = 65). Please carefully note the specific information requested for the nucleus by the letter designation.

35 2 8 18 2

An alpha particle has a mass number of 2. True False

False

Atomic mass is the sum of protons plus electrons. True False

False

Photons are also known as beta particles. True False

False

The energy of a photon is directly proportional to its wavelength. True False

False

A beta particle is emitted by a nucleus. True False

True

A fusion example is the combining of hydrogen isotopes. True False

True

A rapid and continuous series of nuclear reactions is called a chain reaction. True False

True

All atomic nuclei except those of ordinary hydrogen contain neutrons. True False

True

If a photon and an electron have the same energy, they will also have the same frequency. True False

True

The product of the uncertainties regarding the position and momentum of a particle is approximately equal to Planck's constant. True False

True

The electron structures of atoms are not involved in the emission of: X-rays photoelectrons gamma rays spectral lines

gamma rays

A hydrogen atom is in its ground state when its orbital electron: is in its lowest energy level has escaped from the atom is within the nucleus is stationary

is in its lowest energy level

An electron in the Bohr model of hydrogen revolves around the nucleus to: keep from being pulled into the nucleus possess energy emit photons keep from being repelled by the nucleus

keep from being pulled into the nucleus

After a nucleus undergoes radioactive decay, its new mass number is: never less than its original mass number never more than its original mass number always less than its original mass number always more than its original mass number

never more than its original mass number

The uncertainty principle states that: moving charged particles resemble electromagnetic waves in their behavior neither the position nor the mass of a particle can ever be precisely determined the position and momentum of a particle cannot be precisely determined moving bodies exhibit both particle and wave properties

the position and momentum of a particle cannot be precisely determined

The principle of the photoelectric effect is: the quantum theory of radiation the special theory of relativity the principle of superposition the electromagnetic theory of light

the quantum theory of radiation

If a photon and an electron have the same wavelength: the photon has the greater momentum either may have the greater momentum, depending upon the value of the wavelength the electron has the greater momentum they have the same momentum

they have the same momentum

An atom emits a photon when one of its electrons: collides with another of its electrons undergoes a transition to a quantum state of lower energy undergoes a transition to a quantum state of higher energy exchanges quantum states with another of its electrons

undergoes a transition to a quantum state of lower energy