23 Stellar Evolution Review

Energy is generated in the cores of stars by fusing ___

• hydrogen into helium
• helium into hydrogen
• hydrogen into lithium
• helium into lithium

The expansion created by the heat of fusion is usually balanced by a star's gravity, creating ___

• an imbalance
• a conversion
• an inversion
• an equilibrium

Objects with a mass range between the heaviest planets and the lightest stars became known as ___

• red gnomes
• brown gnomes
• red dwarfs
• brown dwarfs

Which delicate molecule was found in the spectrum of Gliese 229B, the first T dwarf?

• carbon monoxide
• carbon dioxide
• methane
• ammonia

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

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

If you look at the Sun's spectrum, it actually peaks ___

• in the red
• in the blue
• in the green
• in the yellow

The total amount of energy emitted by a star is called its ___

• incandescence
• luminosity
• spectral integrity
• apparent brightness

The light from the Sun is white but some of the shorter wavelengths get scattered away by ___

• atoms of oxygen in the air
• atoms of argon in the air
• molecules of nitrogen in the air
• molecules of oxygen in the air

A plot of a stars luminosity vs it's temperature is called ___

• an HR diagram, after Hertzsprung and Russell
• an HC diagram, after Hertzsprung and Cannon
• an CR diagram, after Cannon and Russell
• an HS diagram, after Hertzsprung and Saha