1
Q
what does activity mean in half life
A
the number of decays per second; it is measured in Bq
2
Q
what are radioactive isotopes
A
they have unstable nuclei that will decay over time and emit ionising radiation
3
Q
what is radioactive half-life
A
the time taken for activity of a sample of a radioactive isotope to halve
4
Q
a sample of high activity has many or few decays per second?
A
a sample of high activity has many decays per second, while a sample of low activity has low decays per second
5
Q
A
physics
flashcards
Decks in class (27)
# Cards
-
plotting magnetic fileds13
-
field of an electromagnet7
-
more turns on an electromagnet3
-
strength of an electromagnet9
-
measuring the strength of an electromagnet10
-
applications of electromagnets22
-
momentum16
-
light and the electromagnetic spectrum29
-
radioactivity47
-
the moter effect10
-
circuits and currents26
-
physics - key concepts4
-
physics - motion + forces16
-
conservation of energy39
-
dangers of an electric shock34
-
PAPER 2: (the Particle Model) - particles and density + energy and changes of state + energy calculations45
-
PAPER 2: short circuits and earth wires18
-
power of an appliance or electric circuit11
-
graphs (acceleration/velocity..)7
-
physics -motions10
-
transformers - PAPER 212
-
electric in parallel circuits13
-
PAPER 2 : energy15
-
PAPER 2: Electricity and Circuits16
-
half life5
-
physics - forces (including newtons first and second law)21
-
waves16
