Waves Flashcards
(29 cards)
What do we call materials that allow only some light to pass through
Translucent
What do we call materials that allow
light to pass through easily
Transparent
What do we call materials that allow
no light to pass through
Opaque
How are shadows formed
Shadows are formed by opaque objects blocking light
Why might some shadows not have crisp edges
Because the light source is much wider than the object
True or false the angle of incidence always equals the angle of reflection
True
What is the angle of reflection
The angle if which the beam of light is reflected off a mirror
What is refraction
When a wave or light ray changes speed and direction as it passes through a different medium.
What are the colours of the visible spectrum of light ( white light)
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Which colour of light refracts the least
Red light
Which colour of light refracts the most
Violet light
What are the 3 primary colors that our eyes can detect?
Red, green, and blue
What do the primary colors together make up?
White light
What determines the color an object appears?
The color of light it reflects
Fill in the blank: The dyes used on a blue book absorb all the colors on the spectrum of light apart from _______.
Blue
What is frequency? What is it measured in?
Frequency is the number of waves per second. It is measured in Hertz.
What are the two types of waves?
Transverse, Longitudinal
What is the difference between a transverse and a longitudinal wave?
A transverse wave has a wave direction that is at 90 degrees to the vibration. A longitudinal wave has a wave direction that is parallel to the vibration.
What is amplitude?
Amplitude is the distance from the centre line to the top/bottom of the wave.
What is wavelength?
The length of one wave
What is required for sound to transfer?
Particles
Sound requires particles to transfer across; the closer the particles, the faster the vibration can travel.
What is the formula for distance?
Distance = Speed multiplied by Time
How fast does sound travel in air?
330 metres per second
How fast does sound travel in water?
1500 metres per second
