Physics Ch26.1/2 Flashcards
The properties of the strong nuclear force are as follows:
The strong nuclear force acts over a very short range (~1015 m). The strong nuclear force is always attractive and acts with nearly
equal strength on protons and neutrons.
The strong nuclear force does not act on electrons; therefore, it has no effect on the chemical properties of an atom.
Beta ray formula
N—> p+(-e)+(ve-)+energy
Aluminum beta ray
Penetrates few mm ( both neg and positive)
What are the 4 rays or energies emitted when a nucleus decays?
Beta ray(+)
Beta ray(-)
Alpha ray
Gamma rays
Alpha ray loses?
Loses 2p and 2n
Aluminum alpha ray?
It stops at the covering
What is this called e+
Positron
Beta ray (-) has a ____ nuclear reaction?
Weak nuclear reaction
Beta ray(-) formula
Same as old but e and ve are positive
Gamma ray properties?
It happens in series
Number of p and n are the Same
Aluminum gamma?
Pass through sheet
What is radioactivity?
The particles and photons emitted when a nucleus decays.
Nuclear binding energy?
The difffrence in energy between a complete nucleus and it’s separated individual parts.
When is the nuclear binding energy released?
Fusion and fission. The energy released in fusion or fission corresponds to a decrease in mass, according to Einstein.
Fusion is?
When a small nucleus are fused together to form a larger nucleus
Fission?
When a large nucleus decays into smaller nucleus
What is the strong nuclear force?
The force that acts on the protons inside the nucleus, in a short range about 10^-15 m.
Protons and neutrons are called?
Nucleons
Most of the mass of the atom is in the ?
Nucleus
Density of the nucleus
2.3 x 10^17 kg/m^2
A is
Mass number/ atomic mass
Atomic number is
Number of protons
Isotopes have?
Diff neutrons same protons thus diff atomic mass
The Atom is stable when?
Small atom n>z n=z
Atom not stable when?
Z>n
The constant repulsion force of 2 protons is
F= 230 N
Distance between 2 protons
R= 10^-15
Acceleration of the proton
1.4 x 10^29 m/s^2
Formula of Columb’s law
F= ke^2/r^2
Albert Einstein energy formula
E= mc^2
