Waves - sound and light Flashcards
How does light travel
Light travels in transverse waves
How does sound travel
Sound travels in longitudinal waves
What is a wave
A wave is a vibration which transfers energy
What are the three measurements of a wave
Amplitude, wavelength and frequency
What does opaque mean
Opaque means you can’t see through it
What does transparent mean
Transparent means you can see through it
Name three things that produce light
Optional e.g sun, candle, light bulb, glow worms
Name three things that reflect light
Everything other than luminous objects e.g the moon, planet and a human
What travels fastest light or sound give one piece of evidence
Light travels fastest we know this because we see lightning before we hear it
Why do we see things
Because light reflects of objects into our eyes
What is refraction
Refraction is when the light bends because it has entered a different medium
Does the light bend towards or away from the normal when it enters a more dense medium
The light bends towards the normal when it enters a more dense medium
Why does light bend in refraction
The light bends because it’s speed changes
What is reflection
Reflection is when a wave bounces off an o surface
What does the angle of incidence equal when the light is reflected off of a mirror
Angle of reflection
What do we call the incoming ray and out going ray in reflection
Incident ray and outgoing ray
Draw a diagram showing where a fish would appear to be
The fish would appear to be higher in the water than it really is
What are the three primary coulors
Red , green and blue
What are the three secondary coulors
Yellow, cyan and magenta
What color do you get when the three primary colours meet
White
What colour would a red filter let through
Red
Which colour has the longest wavelength
Red
Which colour has the highest frequency
Violet
Can sound or light travel through a vacuum, explain
Sound can not travel through a vacuum but light can. Sound needs particles to travel through where as light doesn’t
Does sound travel fastest through air or water
Sound travels faster through water because the particles are more dense
What determines the pitch of a sound
The frequency of the wave
The higher the frequency the higher the what
Pitch
What is the formulae for working out the speed of sound
Speed=distance/time
What determines the loudness of a sound
Amplitude
The higher the amplitude the louder the sound/true or false
True
Draw four wave forms for the following sounds: a loud sound, a quiet sound, a high pitched sound and a low pitched sound
Get someone to check
Draw a diagram of a periscope
Get someone to check
