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
