Physics revision Flashcards
What two types of waves are there
Transversal longitudinal
What is the equation for distance
Distance=speed of sound x time
Transversal
Water waves and electro magnet waves
What is the speed of sound in air
340 m/s
Longitudinal
Sound wave
An echo is a
Sound reflection
Transverse waves occure when
oscillations are perpendicular or at right angles (90°) to the direction of travel.
Longitudinal waves are
oscillations which occur parallel to the direction of travel.
What does sound need to travel through
A medium
The speed of sound in gas is
Very slow
The more rigid a medeum is the
Higher the speed of sound travelling through it
The more compressible a medium
The lower the speed of sound travelling through it
Solids are
Rigid
Gases are
Compressable
Liquids are
More rigid and less compressable then gases (in the middle)
What do we call a sound wave which has reflected off a wall?
Echo
What is frequency
The number of sound waves that happen in one second
What is frequency measures in
Hertz
A high pitched sound means
The particles of vibrating very quickly
Sounds above 20,000 HZ it’s called
Ultrasound
Sound below 20 HZ is called
Intrasound
Frequency effect sounds
Pitch
Light travels as
Transverse waves
can light travel in a vacuum
Yes
Objects that do not allow light to transmit through them are called
opaque
Objects that look light through them are called
Transparent
Objects that scater light are called
Translucent
When does light change speed?
When it passes through different medium or substances
When light changes speed what is it known as?
A refraction ray
Which colour has the lowest frequency?
Red
What is a red object doing?
Reflecting red and absorbing all the other colours
Is white light reflecting all colours or absorbing or colours?
Reflecting.
When something is pitch black, it means it is.
Absorbing All colours
Independent variable is the variable
You change in an experement
The dependent variable is the variable that is
measured in an experiment.
Control variables are the variables that are
kept the same in an experiment.
Control variables help you to measure
What’s the difference between continuosand discrete data
Continuous is measured and discrete is counted
Draw line graphs when data is
Continuous/is measured
