__ Effect, Changing Wavelength Caused by Motion
Puzzle 7 of Leonardo DiCaprio Easy Pack
Question is: __ Effect, Changing Wavelength Caused by Motion
and the answer is: DOPPLER
Word Meaning:
DOPPLER — (medicine, by ellipsis, informal) Ellipsis of Doppler ultrasonography: Any of various types of ultrasonography that use the Doppler effect; especially, medical versions thereof.
Definitions from Wiktionary.