Multiple Choice
One way to distinguish stars from planets,particularly when they appear near the horizon,is that stars appear to twinkle and planets shine steadily.Which of the following statements is a reasonable explanation for this phenomenon?
A) Stars actually do twinkle-shine with a light that flickers bright and dim-whereas planets shine with a steady, unwavering light.
B) The light from planets is so much brighter than the light from stars (when they are observed from Earth) that it is unaffected by air movement in Earth's atmosphere.
C) The disk of a planet, as observed from Earth, appears larger than the disk of a star. Thus, if refraction through moving air in Earth's atmosphere makes the planet's disk appear to move about slightly, there will normally be a central part of the disk that shines steadily and does not appear to twinkle.
D) Because light from planets is reflected, it is unaffected by the refraction in Earth's atmosphere.
Correct Answer:
Verified
Correct Answer:
Verified
Q21: Suppose Rømer had used Saturn and one
Q54: A Newtonian telescope uses<br>A) only one mirror
Q100: Why was adaptive optics developed?<br>A) to prevent
Q185: The series of spectral absorption lines in
Q227: The diameter of the nucleus of a
Q228: Which of the following can travel at
Q229: If you want to design a device
Q232: Consider an atom in which electron transitions
Q234: The series of spectral absorption lines in
Q235: If you send white light through a