Waves
What is the unit for wave speed?
Meters per second (m/s)
What is renewable energy?
Energy sources that are not limitted
What is force?
A push or pull that amkes an object change direction or speed.
What is thermal expansion?
The tendancy of an object to change in volume in response to a change in temperature.
What is the law of reflection?
i=r
What is the formula for wave speed?
frequency × wave length
What is the formula for pressure?
force/area
Name four types of contact forces:
Friction, reaction, applied, tension.
Is lead a better thermal conductor than glass?
Yes
What is the speed of light?
300,000,000 m/s
What is it called when a wave passes through a gap in a barrier?
Diffraction
What is the useful energy transfer for a person cycling?
Chemical to kinetic
What makes an object stable?
The width of the base is wider and the centre of mass is closer to the ground.
What is a thermocouple?
A device that gives an output voltage based on temperature.
What is a virtual image?
An imgae that can only be seen through a lens or a mirrored surface.
What is the maximum displacemwnt from the equilibrium called?
Amplitude
What is the source of the sun's energy?
Nuclear fusion
What happens to an object once it passes the limit of proportionality?
The object becomes permanently deformed
How does drought accross a surface effect the rate of evaporation?
particles escape from the water and are blown away so they cannot fall back in and therefore increase the rate of evaporation.
What three things may happen to light that strikes an object?
The light may be transmitted, reflected or absorbed
What is the area of a longitudinal wave where particles are pushed close together?
Compressions
What is nuclear fusion?
When two or more energetic atoms fuse to create a larger atom
Name the three types of non-contact forces:
Magnetic, gravitational and electrostatic
What is the difference between evaporation and boiling?
Evaporation can happen in any temperature whilst boiling happens only at a specific temperature.
What is refractive index?
A quantity that describes how much light is slowed down or sped up when enetering a new medium.