6. Which two points on the wave are in phase? C B D 7. What is the period of a wave if 20 crests pass an observer in 4 seconds!Assessment/Homework: the frequency of a light wave is 5-0 x 10" hertz. What is the period of the wave? 2. The amplitude of a sound wave is to its loudness as the amplitude of a light wave is to its 3. "is a sound wave travels through the air, there is a net transfer of a. energy, only b. mass, only c. both mass and energy d. neither mass nor energy 4. In the diagram below, a. Find the amplitude of each wave. b. Find the wavelength of each wave. c. Find the frequency of each wave. d. What is the speed of wave A? e. Which two waves have the same wavelength? f. Which wave has the longest period? O -2 4 12 m , 2 sec 5. What is the frequency of the following wave? 0.01 - 0.05 0.10 Time Displacement (m) 0.00 (S) 0.01