ASTR 102 Midterm 2 | 100% Correct Answers |
Verified | Latest 2024 Version
A star has an apparent brightness of -2 and an absolute brightness of 1. What must be true?
Select one:
a. The star is further than 10 parsecs
b. The star is at 10 parsecs
c. The star is closer than 10 parsecs
d. The star is close to exploding - ✔✔c
What is special about electromagnetic waves?
Select one:
a. We can see all of them
b. They do not need a medium to travel
c. They only exist near stars
d. Each color travels at a different speed - ✔✔b
A star that has a smaller absolute brightness than another, is most likely also _____.
Select one:
a. a hotter spectral class
b. peaking in the visible spectrum
c. a cooler spectral class
d. has a much larger wavelength
e. a lower frequency - ✔✔a
What spectral class is our Sun?
,Select one:
a. M
b. T
c. O
d. B
e. F
f. L
g. K
h. G
i. A - ✔✔h
Why don't we see green stars?
Select one:
a. Because green light is not emitted strongly.
b. Because stars can't emit green light.
c. Because our eyes are more sensitive to other colors.
d. Because green is right in the middle of the visible spectrum. - ✔✔d
The annoying sound from a mosquito occurs because it beats its wings at the average rate of 600 times
per second. What is the frequency of the sounds waves it generates?
Select one:
a. 6 hz
b. 1/600 hz
c. 600 hz
d. 1/6 hz - ✔✔c
At what wavelength does the visible spectrum peak?
, Select one:
a. Around 400 nm
b. Around 700 nm
c. Around 900 m
d. Around 550 nm - ✔✔d
Why does every element emit a unique spectrum?
Select one:
a. Because each element can only be heated up so much
b. Because each element has a different number of neutrons
c. Because each element has a different number of protons
d. Because each element has a different electron orbital configuration - ✔✔d
Which spectral class stars are most abundant in the universe?
Select one:
a. O
b. A
c. M
d. G - ✔✔c
Why is apparent brightness NOT a good way to scientifically compare stars?
Select one:
a. Because it does not take into account individual differences in people's eyesight
b. Because a star's apparent brightness can change based on the weather
c. Because it only works in a single location in space
d. Because it isn't a real thing - ✔✔c
Verified | Latest 2024 Version
A star has an apparent brightness of -2 and an absolute brightness of 1. What must be true?
Select one:
a. The star is further than 10 parsecs
b. The star is at 10 parsecs
c. The star is closer than 10 parsecs
d. The star is close to exploding - ✔✔c
What is special about electromagnetic waves?
Select one:
a. We can see all of them
b. They do not need a medium to travel
c. They only exist near stars
d. Each color travels at a different speed - ✔✔b
A star that has a smaller absolute brightness than another, is most likely also _____.
Select one:
a. a hotter spectral class
b. peaking in the visible spectrum
c. a cooler spectral class
d. has a much larger wavelength
e. a lower frequency - ✔✔a
What spectral class is our Sun?
,Select one:
a. M
b. T
c. O
d. B
e. F
f. L
g. K
h. G
i. A - ✔✔h
Why don't we see green stars?
Select one:
a. Because green light is not emitted strongly.
b. Because stars can't emit green light.
c. Because our eyes are more sensitive to other colors.
d. Because green is right in the middle of the visible spectrum. - ✔✔d
The annoying sound from a mosquito occurs because it beats its wings at the average rate of 600 times
per second. What is the frequency of the sounds waves it generates?
Select one:
a. 6 hz
b. 1/600 hz
c. 600 hz
d. 1/6 hz - ✔✔c
At what wavelength does the visible spectrum peak?
, Select one:
a. Around 400 nm
b. Around 700 nm
c. Around 900 m
d. Around 550 nm - ✔✔d
Why does every element emit a unique spectrum?
Select one:
a. Because each element can only be heated up so much
b. Because each element has a different number of neutrons
c. Because each element has a different number of protons
d. Because each element has a different electron orbital configuration - ✔✔d
Which spectral class stars are most abundant in the universe?
Select one:
a. O
b. A
c. M
d. G - ✔✔c
Why is apparent brightness NOT a good way to scientifically compare stars?
Select one:
a. Because it does not take into account individual differences in people's eyesight
b. Because a star's apparent brightness can change based on the weather
c. Because it only works in a single location in space
d. Because it isn't a real thing - ✔✔c
