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17 Cards in this Set
- Front
- Back
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Geocentric model
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The belief that the Sun, Moon, planets and stars all orbited the Earth in perfect circles
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Heliocentric model
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States that the Earth and planets all orbit the Sun at the centre of the Universe (replaced the Geocentric model)
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Galileo's observations of Jupiter's moons
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Showed not everything was in orbit around the Earth proving the Geocentric model wrong
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Wavelength
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The distance from one peak to the next
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Frequency
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How many complete waves pass a point per second (measured in Hz)
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Amplitude
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The height of the wave
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Speed (m/s) =
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Frequency (Hz) x Wavelength (m)
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Wave speed (m/s)
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Distance (m) / Time (s)
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Transverse waves
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S-waves on strings and springs e.g. ripples on water.
Includes all EM waves and Light |
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Longitudinal waves
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P-waves including sound and ultrasound e.g. a slinky spring
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Angle of reflection (r) =
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Angle of incidence (i)
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Focal point
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Where the rays hitting the lens parallel to the axis all meet
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Focal length
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The distance from the lens to its focal point
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Normal
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The line at right angles to the surface
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Refracting telescope
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Made up of an objective lens and an eyepiece lens and uses two converging lenses
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Reflecting telescope
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Uses concave mirrors and a converging lens
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Converging eyepiece lens
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Used to magnify the image
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