Stars

When you divide the incoming light from an object into individual colors or wavelengths it's called ___

• a time-series graph
• a spectrum
• a Fourier transform
• a histogram

Hot objects, that emit light at all wavelengths, are said to give off ___

• a fractured spectrum
• an extended spectrum
• a single line spectrum
• a continuous spectrum

The continuous spectrum of a star has gaps in it, darker bands where different elements ___

• absorb different colors
• reflect different colors
• transmit different colors
• refract different colors

In 1901, who developed a system to classify stars using many different absorption lines in their spectra?

• Marie Skłodowska Curie
• Rosalind Franklin
• Annie Jump Cannon
• Lise Meitner

Which physicist showed how objects emit light of different colors based on their temperature?

• Albert Einstein
• James Clerk Maxwell 
• Niels Bohr
• Max Planck

Hotter stars put out more light at the blue end of the spectrum, while cooler ones peak ___

• in the red
• in the yellow
• in the green
• in the violet

Cecelia Payne-Gaposchkin showed that the spectra of stars depended on their ___

• density and elements in their atmospheres
• temperature and elements in their atmospheres
• temperature and molecules in their atmospheres
• age and molecules in their atmospheres

Payne-Goposchkin showed that stars were overwhelmingly composed of ___

• hydrogen
• helium
• carbon
• oxygen

The classification scheme used today arranges stars by ___

• their size, assigning each a number
• their size, assigning each a letter
• their temperature, assigning each a number
• their temperature, assigning each a letter

The letters 'O', 'B', 'A', 'F', 'G', 'K' and 'M' arrange stars in order from ___

• hottest to coolest
• coolest to hottest
• largest to smallest
• smallest to largest