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Physics Induction test
Terms in this set (19)
Gravitational field strength - the ratio of an object's weight to its mass
What is g?
energy / time
force x speed
current x voltage
current^2 x resistance
voltage^2 / resistance
Charge / time
Work done / Charge
Current x Resistance
Current is the same everywhere in a series circuit, and is shared between the branches of a parallel circuit.
What is Kirchoff's first law?
For any closed loop in a circuit, the sum of the potential differences across the components equals the potential difference of the power supply.
It means that:
In a series circuit, the potential difference of the power supply is split between all the components.
In a parallel circuit, each loop has the same potential difference as the power supply.
What is Kirchoff's second law?
What does it mean?
Provided the temperature is constant, the current through an ohmic component is directly proportional to the potential difference across it.
State Ohm's law.
Watts (or J/s)
What is the unit you answer with if the question asks you,
"...at what rate is it doing work?"
frequency = 1 / time period
What is the equation for frequency?
wave speed = frequency x wavelength
What is the equation for wave speed?
If two waves meet they will briefly combine and become one single wave, with a displacement equal to the displacement of each individual wave added together.
What is meant by superposition?
When the superposed wave has an amplitude greater than that of the individual wave components.
Destructive interference is when the superposed wave has a lower amplitude.
What is meant by constructive interference?
angle of incidence = angle of reflection
what is the law of reflection?
the light diffracts as it passes through the slit and forms a diffraction pattern of light and dark fringes (on a screen behind the slit)
what happens when light is shone at a slit about the same size as its wavelength?
the ratio of the speed of light in a vacuum to the speed of light in that medium
what is the refractive index of a medium?
refractive index (n) = sin i / sin r
What is Snell's law (equation)?
nucleon number decreases by 4
proton number decreases by 2
nucleus emits an alpha particle (helium nucleus)
What happens to the proton and nucleon numbers during alpha decay?
nucleon number remains the same
proton number decreases by 1
neutron turns into proton and electron; electron (beta particle) is emitted from nucleus
What happens to the proton and nucleon numbers during beta decay?
High-energy EM radiation (gamma radiation) is emitted from the nucleus.
Number of protons and neutrons stays the same.
What happens during gamma decay?
What happens to the number of protons and neutrons?
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