new Flashcards
Frequency
waves per second
Frequency measurement
Hertz(Hz)
wavelength
the length between one specific point in a wave and the same point in the next wave.
Vibration/ocillations
A repeated back-and-forth or up-and-down motion
Loudness
Human perception of sound intensity
Pitch
How high or low a sound is
what is pitch determined by
The number of vibrations per second or frequency determines the pitch of a sound. Frequency is directly proportional to pitch. Higher the frequency, the higher the pitch.
Vacuum
A space where no particles of matter exist
Decibel
a unit that compares the loudness of different sounds(dB)
range of frequencies a person can hear
20-20000Hz
What happens to a soundwave when you hear an echo?
The sound wave is reflected.
The unit to measure frequency
Hertz(Hz)
Which wave is fastest-light or sound?
Light
Which wave is fastest-light in air or light in water?
Light in air
Which wave is fastest-sound in air or sound in water?
Sound in water
Which material lets all light through?
Transparent.
Which material lets some light through?
Translucent
Which material doesnt let any light through?
Opaque
Low frequency =
High frequency =
low pitch
high pitch
Loud =
Quiet =
large amplitude
small amplitude
waves
Waves are oscillations or vibrations. All waves transfer energy.
what happens to the matter around an on coming wave
The matter a wave passes through does not move from its position.
Longitudinal waves
Longitudinal waves are oscillations that occur parallel to the direction of travel.
what happens to particles in a longitudinal wave
In a longitudinal wave, the particles come close together and then push apart.
what is it called when the particles are far apart
When the particles are far apart, this is called a rarefaction.
what is it called when the particles are close together
When the particles are close together, this is called compression
An example of a longitudinal wave
An example of a longitudinal wave is a sound wave.
another name for longitudinal waves
Longitudinal waves are also called pressure waves.
Transverse waves
Transverse waves occur when the oscillations are perpendicular or at right angles (90°) to the direction of travel.
Examples of transverse
Examples of transverse waves include water waves and electromagnetic waves.
wave speed calculation
Wave speed is calculated using the equation:
Wave speed = frequency × wavelength.
Wave speed is measured in m/s.
Wavelength is measured in
metres (m)
speed of light
Light travels at 300,000,000 m/s.
speed of sound
Sound travels at 340 m/s in air.
light
Travels as transverse waves.
Light is electromagnetic radiation.
Light can travel through a vacuum.
It takes about eight minutes for the Sun’s light to reach us traveling at 300,000,000 m/s.
Law of reflection
The law of reflection states:
The angle of incidence equals the angle of reflection.
We are able to see objects as light reflects off objects into our eyes.
When reflection happens, it always follows the law of reflection
distance equation
Distance = speed × time
Peak or crest
the top of a wave.
Trough
the bottom of a wave.
Amplitude
the distance from the middle to the crest or trough of the wave.
