- 1. Before teaching your manager about sources of light and creating colours he needs some basic facts about the properties of light! From your note 'Electro magnetic Spectrum', put a check beside all the true facts about light: __ Light always travels in a straight line __ Light always travels in crazy loops from the sun to the earth __ Light travels in a wave __ Light is generally described as electromagnetic radiation waves __ The electromagnetic spectrum consists only of invisible waves L1
- 11. Give the equations used to calculate current potential difference (voltage)and resistance.
- 1. Explain how stars are formed in a nebula.
- The Structure of an Atom 1) The centre of an atom is known as the __ 2) The nucleus of an atom contains two different types of particles, __ and __ 3) Orbiting at different distances around the nucleus of an atom are a third type of particle, called __ Electric Charges 4) Protons carry a __ charge, while electrons carry a __ charge and neutrons have __ 5) The charge of one proton is __ in strength when compared to the charge of one electron. 6) When the number of protons and electrons in an atom is equal.that atom is said to be __ . Electron Mobility 7) __ that are at a greater distance from the nucleus have greater mobility, which allows them to move from one atom to another. 8) Neutral atoms that lose electrons become __ charged, and are known as __ 9) Neutral atoms that gain electrons become __ charged, and are known as __ -... Attraction 10) Opposite charges __ and similar charges __ 11) Thus, protons repel __ and attract __ whilc electrons repel __ and attract __ 12) Also, any charged object will attract a __ object.
- 8. How do longitudinal waves differ from transverse waves?Use a diagram and have example for each. 9. A plane flies at Mach2.2. How long does it take to fly across the Atlantic Ocean which is approximate 8.0times 10^3km across. (air temp=0^circ C) [3.1hrs] 10. A standing wave is produced on a 1.0 m spring with 5 nodes (including fixed ends). a. How many antinodes are there? [4] If the frequency of the source is 5.0Hz, what is the speed of the wave? [2.5m/s] 11. In a closed air column, a tuning fork of frequency 128Hz is struck and the temperature is 22^circ C a. Determine the first resonant length of the air column. [0.67m]
