Waves and the Electromagnetic spectrum

Frage	Antworten
What is the order of the electromagnetic spectrum from high frequency and low wavelength to low frequency to high wavelength?	Gamma X-ray Ultraviolet Visible light Infra red Microwave *Radiowave
What is the mnemonic used to remember the electromagnetic spectrum?	Granny's X-box Uses Volts In My *Room
What is a longitudinal wave?	A wave which the direction of the vibrations of the particles are the para..llel to the direction of which the waves travel.
What is a transverse wave?	Waves in which the directions of the vibration is perpendicular to the direction of which the wave is traveling.
What is the wavelength the distance between?	*It is the distance from one wave peak to another. Image: physics (image/jpg)
What is the frequency of a wave and what is it measured in?	The number of complete waves passing a fixed point per second.
What does a wave look like if it's compressed?	The wave will be in straight lines close together.
What does a wave look like if it has a rarefaction?	The waves will be more spread apart.
What is a radiowave used for?	*Communication
What is a microwave used for?	*Satellite communication and cooking
What is Infra-red used for?	Remote controls Thermal cameras
What is Visible light used as?	Seeing Optical fiber communication
What is ultraviolet light used for?	Florescent tubes Security markings.
What is an X-ray used for?	*Creating images of the inside of the body.
What are gamma rays used for?	Sterilizing medical equipment Treating tumors
All the members of the E-M spectrum are what type of waves?	*Transverse waves
What is the law of refraction?	The angle of incidence=the same as the angle of reflection
When a light ray travels from air to glass which way does it reflect?	Away from the normal.
When light travels from glass into the air what happens?	It refracts towards the normal.
Name some properties of waves that make it useful for satellite communication?	They can pass through the atmosphere.
The higher the ...... the further the waves travel?	Frequency
What can visible light and microwaves both do?	Be reflected Travel through a vacuum at the same speed.
What do high frequency waves look like?	Tall and have a high pitch.
The bell in a jar experiment shows what?	That sound vibrations cannot travel through a vacuum
What are reflected images?	Virtual Upright *Laterally inverted
m/s = hertz (HZ) x meters?	Wave speed = Frequency x Waveleghth
Definition refraction?	The change in direction of a wave when it moves from one substance to another e.g from air to glass.
When light moves from a less dense substance to a more dense substance what happens?	The light speeds up.
Definition diffraction?	This is the spreading out of waves, and how they pass through a gap.
What happens when something diffracts through a wide gap?	The wave stays the same still fairly spread out Image: WIN_20141105_144718.JPG (image/JPG)
What happens with diffraction through a narrow gap? (Think of wide pipes and thin ones)	There's more diffraction because it will start with smaller waves and then the wave will spread out more again. Like a radiowave Image: WIN_20141105_144957.JPG (image/JPG)
What happens with diffraction around an obstacle?	Th wave splits in half and reduces in size and it will meet up again after passing through the object. Image: WIN_20141105_145253.JPG (image/JPG)
Why are the Tv and radio transitions different?	The Tv is diffracted less, where as the radio is longer and diffracted more.
What do waves transfer from place to place?	Energy!
What is the equation for speed?	Speed=distance x time
You always need to convert to Hertz!	20KHz is the same as 2000Hz MHz-Hz you add 6 zeros' KHz-Hz you add two zeros
The colors of the rainbow!	Richard Of York Gave Battle In Vain.

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Waves and the Electromagnetic spectrum

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