QUESTION 22
Spectral lines can act like a __________ to help astronomers identify the chemical __________ of the electromagnetic radiation characteristics of a star.
a.composition; fingerprint
b.class; composition
c.fingerprint; structure
d.fingerprint; composition
QUESTION 23
A simple example of the Doppler effect in everyday experience is a(n)
a.tree and its leaves
b.train and its tracks.c.ambulance and its siren.
d.car and its passengers.
QUESTION 24
a.cooler; shorter
b.cooler; longer
c.hotter; shorter
d.hotter; longer
QUESTION 25
a.objective lens that refracts incoming light and concentrates it at a focus behind the lens. A second lens, the eyepiece, magnifies the concentrated light so that objects appear larger.
b.objective lens that reflects incoming light and concentrates it at a focus in front of the lens.
c.curved mirror that reflects light to a focus in front of a mirror. The larger the area of the mirror, the more light the telescope can gather. A smaller mirror at the focus sends the concentrated light to an eyepiece at the back or at the side of the telescope.
d.flat mirror that refracts light to a focus in front of a mirror. The smaller the area of the mirror, the more light the telescope can gather. A smaller mirror at the focus sends the concentrated light to an eyepiece at the back or at the side of the telescope.
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