Chapter 10 (Properties of waves) Flashcards
What are waves?
Waves are way of transferring energy from place to place.
What are wavefronts and how are they created?
Wavefront is a line where all the vibration are in phase and the same distance from the source, they are created by overlapping lots of different waves.
What is transverse wave?
A transverse wave is one that vibrates at right angles to the direction in which the energy or wave is moving.
What is longitudinal wave?
A longitudinal wave is one in which the vibrations, are along the direction in which the energy or wave is moving.
What is amplitude?
The maximum movement of particles from the equilibrium position is called amplitude.
What is wavelength?
Wavelength is the distance between a particular point on a wave and the same point on the next wave.
What is frequency of wave (f)?
The number of waves produced each second by a source.
How is the frequency measured?
It is measured in hertz.
What does it mean when a wave has a frequency of 5hz?
A wave source produce five complete waves each second.
What is Time period of the wave (T)?
The time it takes for a source to produce one wave is called the time period of the wave.
What is the formula to find the frequency of wave?
Frequency (f) = 1 / Time period (T)
What is the formula to find wave speed?
wave speed (v) = frequency (f) x wavelength (Λ)
What is the relation between wavelength and frequency?
Wavelength is inversely proportional to frequency.
Higher frequency - shorter wave length
Lower frequency - longer wave length
How are waves reflected?
Waves are reflected by hitting a straight or flat barrier.
What happen to waves as they hit a concave barrier?
They are made to converge.
What happened to waves as they hit the convex surface?
They diverge.
What is refraction of wave?
Change in direction of wave due to change in speed is called refraction.
What happen to wave when its source is moving?
When the source is moving, waves ahead of the source will have shorter wavelength and
higher frequency but wave behind the source will have longer wavelength and lower frequency.
What is doppler effect?
Apparent changes in frequency, which occur when a source is moving is called doppler effect.
What is relation between frequency and pitch?
Directly proportional
