FariÃ±a grew up in Brooklyn, the daughter of two Spanish immigrants who spoke that language at home. At Monday's press conference, she told a story of a postcard that her father, who she said had a third-grade education and taught her about the importance of education, received in the mail from her school.
The Doppler effect is the apparent shift in wave frequency due to the movement of a wave source. The apparent frequency shifts upward when the wave source is approaching and downward when the wave source is retreating. The Doppler effect explains why we perceive a change in pitch of the sound of a passing siren.
No, the Doppler effect is the apparent change in frequency and pitch of a wave due to motion of the source. This question is a test of reading comprehension as well as a test of physics knowledge because it requires you to know the difference between frequency and speed and the definition of the Doppler effect.