Lenses
A lens that is thicker in the centre
Convex
The order of the 8 planets
MVEMJSUN
Cloud of dust and gas
Nebula
The _____________of a wave is the maximum displacement of a point on a wave away from its undisturbed position.
Amplitude
Two North poles do what?
Repel
A lens that is thinner in the middle
Concave
What force keeps satellites in orbit?
Gravity
A large ball of glowing gas (pre star)
Protostar
The ______________ of a wave is the distance from a point on one wave to the equivalent point on the adjacent wave
Wavelength
4 magnetic metals
Iron
Steel
Cobalt
Nickel
What does a lens do to light?
Refract it
What happens to the speed of a satellite as its orbit gets higher?
Decreases
Our sun is what type of star? The force of fusion and gravity are balanced
Main sequence
The ______________ of a wave is the number of waves passing a point each second
Frequency
Two ways to make an electromagnet stronger
Current
Coils
Which type of a lens produces either a real or a virtual image?
Concave
What happens to the force of gravity on a satellite as it gets higher?
Decreases
Large explosion that makes all the element heavier than iron
Supernova
The time taken for one wave to be produced
Period
Why might an electromagnet be more useful in a scrap yard? (2)
Stronger
OFF/ON
What type of image does a concave lens always produce?
Virtual
Is a satellite accelerating?
Y
What two things can come after a supernova?
Neutron star
Black hole
A wave consisting of rarefactions and compressions
Longitudinal
What way does a magnetic field go?
N to S