Cosmology (AQA A-Level Physics): Flashcards

Compression or stretching of waves due to source motion

Higher frequency, shorter wavelength

Higher frequency & shorter wavelength in light waves

Lower frequency, longer wavelength

Lower frequency & longer wavelength in light waves

$z = \frac{v}{c} = \frac{\Delta f}{f} = -\frac{\Delta \lambda}{\lambda}$

Positive = away from Earth; Negative = towards Earth

Identify binary stars too close to separate visually

Binary stars where one passes in front, causing brightness dips

Large red shifts; extremely distant; moving away at high speeds