Question

what color would correspond with the peak wavelength of a star that has an extremely high temperature?
a) green
b) yellow
c) red
d) blue
question 19 (5 points)
which phenomenon occurs when the moon and earth are aligned with the sun?
a) solstice
b) retrograde motion
c) eclipse

Explanation:

• For the first question: According to Wien's displacement law, the peak wavelength of a black - body (a star can be approximated as a black - body) is inversely proportional to its temperature. Shorter wavelengths (such as blue light with a relatively short wavelength in the visible spectrum) correspond to higher temperatures.
• For the second question: An eclipse occurs when the moon and Earth are aligned with the sun. In a solar eclipse, the moon comes between the Earth and the sun; in a lunar eclipse, the Earth comes between the moon and the sun. A solstice is related to the Earth's axial tilt and its position in its orbit around the sun (summer and winter solstices). Retrograde motion is the apparent backward motion of a planet in the sky.

Answer:

• First question: D. Blue
• Second question: C. Eclipse