activity & count-rate Flashcards
1
Q
what is activity
A
the number of unstable atomic nuclei that decay per second in a given sample
2
Q
what is count rate
A
the amount of decays reported by the detector per second
3
Q
(Using decays) count rate=
A
number of decays recorded/ time taken
4
Q
what is a mass number
A
number of neutrons and protons
5
Q
what is a atomic number
A
number of protons
6
Q
if the object is more than two focal lengths away from the lens the image is…
A
smaller than the object.
7
Q
if the object is between one and two focal lengths away from the lens the image is…
A
magnified
8
Q
what is refraction
A
the bending of light as it passes from one transparent substance into another
9
Q
why would a wave be refracted
A
the wave is moving from a less dense medium to a more denser medium, moving closer to the normal
