What is a beta particle
an electron
What is an alpha particle
a helium nucleus which is 2 protons and two neutrons
What is the relationwhicp between kinetic energy and gravitational potential energy in a falling object
kinetic energy gained = potential energy lost
Where do you measure the angles of incidence, reflection and refraction from
The normal
What is the formula for efficency
useful energy output / total energy input
What are the SI units of Power
Watts (W)
What are the SI Units of moments
Mewton meters (Nm)
Name three scalars
Length, mass, time, energy, speed
What is the formula for density
Density = mass / volume (rho, &rho = m/v)
What is the mass number of an element /atom
The number of protons + the number neutrons
What is the formula for kinetic energy
1/2 m v2
What is the mass number of an alpha particle
4 (2 neutrons and 2 protons)
What is the formula which relates voltage, current and resistance
V = IR
What is the formula for momentum
momentum = mass x velocity
P = mv
What is the forumla for the critical angle of a substance
sin c = 1/refractive index
Give an example of a longitudinal wave
Sound,
What are the SI units of length
Meter (m)
What is the formual for the moment of a force
Moment = Force * perpendicular distance from the pivot
What is the formula for Acceleration
Acceleration = change in velocity / Time taken
What is the formula for electrical energy transferred
E = ItV (power = IV and energe is power * time)
What is the formula for the refractive index of a substance in terms of the speed of light
refractive index = speed of light in a vacuum/ speed of light in the substance
What are the SI units of acceleration
meters per second per second (m/s2 or ms-2)<p></p>
What is the period of a wave
the time take for a full cycle of the wave to pass a point
What is the amplitude of a wave
The maximum displacement from the rest position
What is the formula for Force (Newton’s second law)
force = mass x acceleration
F = ma
What are the SI units of energy
Joules (J)
What is the formula for gravitational potential energy
mgh (mass x gravitational stength * difference in height)
What is a transvers wave
One where the direction of oscillation is perpendicular (at right angles to) the directin of travel
What is the relation ship between a wave’s frequency (f) and its period (t)
f = 1/t and t = 1/f
What is the difference between a vector and a scalar
A vector has a magnitude and a direction, a scalar only has a magnitude
What is the SI unit for work done
Joules (J) (work done is energy transferred)
What are the SI units of current
Amp
What is the formula for power
Power = Work done / time taken
What is a longitudinal wave
One where the oscillation (vibrations) are parallel to the direction of travel of the wave
What is the formula for pressue in a liquid
pressure = density * depth * gravity (p= &rho * h * g)
What is the formula for electrical power
P = IV (power = current * voltage)
What is Snell’s law (refractive index)
refractive index = sin(i) / sin ®
Name three vectors
velocity, acceleration, force, momentum, weight
What is the atomic number of an element / atom
The number of protons
What is the formula relatin the velocity of a wave to its frequency and wavelength
v = f * λ (velocity = frequency * wavelength)
What is the SI unit of charge
Coulomb
What is the unit of fequency
Hertz (Hz)
What is the formula for charge passing a point
Q = It (charge = current * time) so I = Q/t so current is chages passing per second
What is the formula for work done
Force x distance (in the direction of the force)
What are the SI units of Force
Newtons (N)
What is the formula for speed or velocity
Speed = Distance moved / Time taken
What is the formula for weight
Weight = Mass x Stength of gravity
W = mg
What is the relationship between work, energy transferred and power
work is the energy transferred, power is the energy transferred per second, so power is also work done per second
What is the symbolfor charge
Q
Give an example of a transverse wave
electromagnetic ratiation (e.g. light), waves on the surfave of water
What is the frequency of a wave
The number of wave cycles passing a point per second
What is the formula for pressure
Pressure = force / area
What are the SI units of mass
kilogram (kg)
What is a watt in terms of Joules and seconds
Watts = Joules / second
What are the SI units of velocity
meters per second (m/s or ms-1)<p></p>
What is Hooke’s law
The extension is proportional to the force applied (if the elastic limit is not reached)