Waves Flashcards
LIGHT WAVES:
What is light produced by?
Luminous objects such as flames, light bulbs and then sun.
An object that produces light is called a?
Light source.
Light is a ____ which always travels in a _________ ____
- Wave 2. straight line
Light waves are ________ - they have ___________ at ______ ______ to the direction the wave is travelling in.
- transverse waves 2.undulations 3. right angles
Light waves ________ ______ from one place to another
Transfer energy
Light waves can be ______ too. This is how mirrors work.
Reflected
Some waves need a _____ to travel through. This substance is called a ______.
- Substance 2. Medium
Water waves are like this- they travel by moving _____ (the water molecules) around. Water is the _____ that a water wave travels through.
- Particles 2. medium
Unlike water waves, light waves don’t need ______ to travel.
Particles
Light from the ___ has to travel through ____ to reach ____
- Sun 2. space 3. Earth
Light waves are _____ ____ by particles.
Slowed down
Light travels _____ when there aren’t many particles to get in the way.
Faster
Light always travels fastest in a _____. A _____ is where there is nothing at all - no air, no particles, nothing. Space is mostly a ______.
1,2,3 Vacuum
The speed of light in a vacuum is?
3x10⁸ m/s (That’s three hundred million metres per second.)
This means light from the Sun gets to Earth in just _____ - even though its 150,000,000 km away
8.3 minutes
The speed of light in a vacuum is a _____. That means it’s always the ____, no matter what colour the light is.
- Constant 2.same
Nothing travels _____ than light in a vacuum.
Faster
The speed of light waves in a vacuum=
3x10⁸ m/s
Light will travel _____ than this when it has to go through a _____ (like air or water)
- Slower 2. Medium
SOUND WAVES:
It’s your ___ _____ that detects any sound that enter your
Ear drums.
WATER WAVES:
A transverse wave has ____________ ( __ and ____ movements) that are at _____ ______ to the _________ the wave is travelling in.
- Undulations 2. Up and down 3. right angles 4. direction
Waves ________ ______ from one place to another.
Transfer energy
The undulations are also at right angles to the direction of ______ ________.
Energy transfer.
Lots of other important waves are __________ too, like _____ waves.
- Transverse 2. Light
If a water wave hits a surface, it will be _________.
Reflected
This causes the _________ of the wave to change.
Direction
___ ______ can be reflected.
All waves
The _____ is the highest part of the wave
Crest
The ______ is the lowest part of the wave.
Trough
The ___________ is how ___ a point on the wave is from the ______ line.
- Displacement 2. far 3. middle
The _________ is the maximum ____________ - the distance from the middle of the wave to a crest or trough.
- Amplitude 2. Displacement
Superposition happens when ___ waves meet.
Two
If two water waves meet, their displacements will _______ briefly.
Combine
This means that they become one single ____, with a ____________ that’s equal to the displacement of each individual wave added together.
- Wave 2. Displacement
This is called _____________.
Superpostion
After combining, the waves then carry on as they were ______.
Before
