waves Flashcards
(41 cards)
what is the order of the electromagnetic spectrum
radio waves, microwaves, infra red, visible light, ultra violet, x-rays, gamma rays
on the left of the EM spectrum they have (wavelength, frequency, energy)
long wavelength, low frequency, low energy
on the right of the EM spectrum they have (wavelength, frequency, energy)
short wavelength, high frequency, high energy
what are radio waves used for
radios, tv, signal, wifi, bluetooth
what are microwaves used for
cooks food, satellite communications , mobile phone
what are infra red used for
electrical heaters, tv remote, cookers, security
what are ultra violet used for
kills bacteria, sun tanning
what are x-rays used for
to help identify broken bones
what are gamma rays used for
medicine, sterilize food and medical equipment
How does mass affect kinetic energy when speed is constant?
More mass means more kinetic energy
ripple tank experiment
1.set up the ripple tank with about 5 cm depth of water
2.Adjust the height of the wooden rod so that it touches the surface of the water
3.Switch on the lamp and motor and adjust until low frequency waves can be clearly seen
4.Measure the length of a number of waves and then divide by the number of waves to find the wave length - you can take a picture and measure from the still image to make it easier
5.Count the number of waves passing a point in ten seconds and then divide by ten to find the frequency
6.Calculate wave speed=frequency x wave length
what is the purpose of a ripple tank
creates small waves in water
what is the aim of the ripple tank experiement
to measure frequency, wavelength and speed by observing water waves in a ripple tank
purpose of waves
to transfer energy without transferring matter
waves can be described as oscillations or vibrations about a position, give 2 examples of this
-sound waves cause air particles to vibrate back and forth
-ripples cause water particles to vibrate up and down
what is the rest position
the undisturbed position of particles or fields when they are not vibrating
what is displacement
the distance that a certain point in the medium has moved more from its rest position
what is the peak
the highest point above the rest position
what is the trough
the lowest point below the rest position
what is amplitude
the maximum displacement of a point from its rest position
what is wavelength
distances covered by a full cycle of the wave (peak to peak or trough to trough)
what is time period
The time taken for one complete oscillation or cycle
what is frequency
number of waves passing a point each second
how to calculate wave speed
wave speed = wave length x frequency
