Question: 4:15 PM Sun May 15 '5' 70% I B Level 19. What measurable characteristic of a wave remains constant no matter what travels through? What

4:15 PM Sun May 15 '5' 70% I B Level 19. What measurable characteristic of a wave remains constant no matter what travels through? What meaSurable characteristic of a wave changes when the wave changes the medium it travels through? 20. Radio Disney in the Bay Area broadcasts on the frequency 1310 kHz. a. What is the period of their broadcast signal? b. What is the wavelength of their broadcast signal? 21. A car engine produces a sound with a frequency of 400 Hz. You hear the frequency of 350 Hz. Is this car moving towards you or away from you? Explain how you know. 22. What is the difference between emission spectra and absorption spectra? Explain what astronomers can learn by studying these spectra? 23. Explain how astronomers determine distances in space? Your answer needs to include methods of objects in our solar system, in our solar system neighborhood and beyond our galaxy. 24. Explain how the 3 pieces of evidence you identied in question #15 supports the Big Bang Theory. /\\ 4 25. Identify key events from the early to mid 19005 that lead to the development of the Big Bang theory / model. Why was this idea so controversial? 5 v You should also review the 3 labs we spent class time working through 0 Gizmos Stellar Spectra Activity 0 Cepheid Variables Lab 0 Hubblc's LBW Lab

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