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CH ECK YOUR UNDERSTANDING #4 HEADS UP! The little blue "4.0!" symbol before an answer box means round your answer to the nearest 1 Hz. And pay close attention to the format tips because some, but not all, answers require you to provide the units. QUIDDITCHI Harry Potter is ying straight toward a hovering snitch at a breakneck speed of 25.5 mis. Use c = 357 m/s. (a) At what frequency is the snitch screaming if the sound heard by Harry is doppler shifted by 1931 Hz? fsnitch = W (b) Harry overshoots the snitch and ends up ying directly away from it at the same speed. What is the doppler shift now? fo=- {c} Harry turns and goes back for another pass, this time traveling at a different speed, but he overshoots again. How fast is he moving if the observed frequency changes by 5.793 H2 as he ies past the screaming snitch? VHarry =