The Universe
Cards (32)
- What do line spectra help identify in stars?
- What happens when substances are very hot?
- How can light from hot gases be viewed?
- What type of spectrum do hot gases emit?
- How can we identify the composition of gas in a star?
- What is a line emission spectrum?
- What does a hot gas cloud release?
- How do line emission spectra act for elements?
- What happens when a gas cools?
- What appears as dark lines in an absorption spectrum?
- How can we identify elements in a cool gas?
- Who invented the spectroscope?
- What did scientists use absorption spectra for in the 19th century?
- What happens to the wavelength of sound when the source moves towards an observer?
- What is the effect called when the wavelength of sound changes due to movement?
- What happens to the pitch of an ambulance siren as it approaches?
- How does the Doppler effect apply to light?
- What is red shift in light?
- What is blue shift in light?
- How can red and blue shifts be observed?
- Who first hypothesized the cosmological red shift?
- What did Hubble observe about galaxies' absorption spectra?
- What does the cosmological red shift indicate about galaxies?
- What correlation did Hubble suggest regarding galaxies and red shift?
- What is Hubble's constant?
- How can Hubble's constant be used?
- How old did Hubble estimate the universe to be?
- What is the current estimate of the universe's age?
- What does the Cosmic Microwave Background Radiation (CMBR) provide evidence for?
- What type of radiation was detected as part of the CMBR?
- What was released during the initial explosion of the universe?
- What happens to gamma waves as the universe expands?