Ch.33 to 35 radiation

The half-life of a radioactive substance is INDEPENDENT of

1. the number (if large enough) of atoms in the substance. 2. whether the substance exists in an elementary state or in a compound. 3. the temperature of the substance. 4. the age of the substance. Answer E) all of these

When an alpha particle is ejected from a nucleus, the nucleus then has less

Mass and Charge

What do electrons have that protons always have in equal magnitude?

charge

The stretching out of time due to motion is called time

dilation.

The sources of X-rays and gamma rays, respectively, are

electron clouds for x-rays and the atomic nucleus for gamma rays

Object and image for a plane mirror lie

equal distances from the mirror

When you approach a blinking light source which in turn is moving towards you, you perceive an increase in

frequency of the light, but not speed.

Which radiation has no electric charge associated with it?

gamma rays

Generally speaking, the larger a nucleus is, the greater its

instability

When a gamma ray is emitted by a nucleus, the nucleus then has appreciably

less A) mass. B) charge. Answer neither of these

The atomic mass number of an element is the same as the number of its

nucleons

The half-life on an isotope is one day.

one-eighth

The atomic number of an element is the same as the number of its

protons

To outside observers, the overall sizes of objects traveling at relativistic speeds are

smaller