Flashcards
The electromagnetic spectrum
Flashcards do conjunto (22)
- 1What is the equation to find a wavelength?v = f x λ
v = speed (m/s)
f = frequency (Hz)
λ = wavelength (m)
Note: values must be converted to suit.
km x 1000
kHz x 1000
cm / 100 - 2What is a longitudinal wave?It is a wave used in sound. It has rarefactions and compressions. It transfers energy and doesn't need particles.
- 3What is a transverse wave?A transverse wave is used in x-rays, water and light. It has troughs and peaks. It transfers energy. It needs particles.
- 4Identify the wavelength
- 5Identify the amplitude
- 6What is frequency and what is it measured in?Frequency is the number of waves that pass a certain point in 1 second. it is measured in Hertz (Hz)
- 7What are waves?Waves are a series of vibrations and oscillations that transfer energy without transferring matter.
- 8Identify the compression and rarefactions.
- 9What is the angle of incidence equal to?The angle of reflection
- 10What properties does a flat mirror have?Laterally inverted
Same distance
Same size
Virtual image - 11What is refraction?When a ray travels from a medium of higher to lower density or vice versa and speeds up or slows down accordingly and in turn changes direction.
- 12What is diffraction?A wave curving after passing through a small gap
- 13When will a wave diffract most?When the gap is closest to the wavelength of the wave.
- 14Does diffraction take place in longitudinal or transverse waves.Both.
- 15How are radio waves used in communications?TV and radio
- 16How are microwaves used in communications?Mobile phones, satellite TV
- 17How are infrared waves used in communications?Remote controls
- 18How are visible light waves used in communications?Photography, optical fibres
- 19What is the Doppler Effect?When a source is moving the sound waves are condensed infant of it so as it comes towards you the pitch is hight and as it goes away from you the pitch is lower.
- 20What is red shift?As an object moves away from you it appears red and has a longer wavelength. As it moves towards you it appears blue and has a shorter wavelength. this only happens when the object is moving at almost the speed of light.
- 21What is the order of the electromagnetic spectrum?Radio, micro, infrared, visible, ultraviolet x-rays, gamma
- 22What speed do electromagnetic waves travel at?300,000,000 m/s or the speed of light
Informações
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- FlashCards sobre The electromagnetic spectrum, criado por Hannah Penny em 05-10-2015.
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- Hannah Penny
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