P1 Topic 1: Visible light and the solar system Match up the following key words: P1 Topic 1: Visible light and the solar system This topic looks at: Models of the Universe Use of reflecting and refracting telescopes Describe what waves are and to calculate wave speed using distance, time wavelength and frequency Key word definition Telescope A telescope consisting of a series of lenses Geocentric The distance from a convex lens to the point where the image of a very distant object is produced Heliocentric Italian scientist who invented the refracting telescope Galileo Sun centred model Ptolemy A device for producing a magnified image of distant objects Copernicus The point where converging light rays meet Refraction Earth centred model   Focal point A lens which is thicker in the middle than it is at the edges Converging lens The change of speed and direction of a wave when it enters a new material Focal length Came up with the geocentric model Refracting telescope Came up with the heliocentric model, but did not have the evidence to prove it Write down 4 disadvantages of using a reflecting telescope 1. 2. 3. 4. Write the names of the planets in our Solar System in the correct order. What is the difference between a refracting telescope and a reflecting telescope? Use the following words – lenses (objective and eyepiece), mirrors, curved primary mirror. Describe the models of the Solar System, including the names of the main scientists involved, and include a diagram for each: Geocentric: heliocentric: Keywords: Geocentric, heliocentric, telescope, refraction, reflection,convex,image Waves Write a definition for the following words: Frequency: Wavelength: Amplitude: Use the equations to calculate the following: Wave speed(m/s) = distance (m) wave speed = frequency(Hz)x wavelength(m) time(s) Calculate the speed of light waves that travel 900,000,000m in 3 seconds. What is the speed of sound waves which have a wavelength of 2m and a frequency of 170Hz? Calculate the wavelength of a wave that travel at 500m/s and have a frequency of 100Hz. If a wave carries a surfer 52 metres in 8 seconds what is the wave speed? If some waves of 13m wavelength have a frequency of 0.5Hz what is the wave speed? Keywords: focal point, waves, frequency, wavelength, amplitude, equation