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.
The Doppler effect widens the spectral lines of rotating objects because the wavelengths changes from blue or red. Blue-shifted, red-shifted, and non-shifted photons mix together to get how its rotating.