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: Draw a diagram to show the frequency, wavelength and amplitude of a wave. Keywords: focal point, waves, frequency, wavelength, amplitude, equation

Use the equations to calculate the following: Wave Equation 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? Describe the difference between a virtual image and a real image Describe the difference between a virtual image and a real image Lenses Draw a diagram for an image through a converging lens. What is the focal length? Describe how you would create an image using a converging lens. 1. 2. 3. Refraction and reflection. When light hits a boundary between one medium and another it can be refracted or reflected Refraction: Complete the diagram to show the incoming and outgoing rays. What changes take place when light travels through different densities of material like a glass block ? In which direction does the light travel as it enters a more dense material Describe how the distance of an object from the lens effects the Image. Object distance real or virtual right way up or upside down Size of image Distance of image 2F real Upside down Same size Between 2F and F Less than F Reflection: The angle of incidence is equal to the angle of ___________________