Quiz #9

A certain radioactive isotope placed near a Geiger counter registers 120 counts per minute. If the half-life of the isotope is one day, what will be the count rate at the end of four days?

7.5 counts/min

A problem with the Bohr model of the atom is that electrons circling the nucleus

Accelerate and should continuously emit radiation

The possible fate of a neutron in ordinary uranium metal is to

All of the possible choices -escape the metal -be absorbed by U-238 without causing fission -cause fission of U-235 if present

Some alpha particles pass through gold foil with very little deflection mainly because the

Atoms of gold are mostly empty space

A beam of electrons can be deflected by a

Both of the possible choices -magnetic field -electric field

A beam of electrons has

Both of the possible choices -wave properties -particle properties

When two light atoms fuse together, mass

Converts to kinetic energy

Carbon-14 is produced in the atmosphere principally by

Cosmic-Ray bombardment

What is the central equation of mass energy equivalence

E=mc^2

Reactions that take place in a breeder reactor change

Elements into different elements

When the nucleus of an atom emits a beta particle, the atom's atomic number

Increases

Compared with protons, neutrons are more effective nuclear bullets in nuclear reaction since they have

No charge

Alpha particle and beta particles are deflected by a magnetic field in

Opposite directions

Radiation dosages based on potential damage is in

REMS

When an electron drops from a higher energy level to a lower one, energy is emitted. In comparison, how much energy is required to reverse the process, going from the lower level to the higher level

The same energy

Fusing two iron nuclei would occur with

absorption of energy

X-rays are emitted by way of

transitions within an atom's innermost electrons

A hypothetical atom has four distinct energy states. Assuming all transitions are possible, the number of spectral lines this atom can produce is

6