Lesson test: What the telescope proved

1.[3p]
A lunar peak is lit while the surface around it is dark, at one twentieth of the moon's diameter from the terminator. With a lunar radius of 1737 km, how high is the peak, in kilometres?

CorrectNot quite: 8.7

2.[3p]
What does the observation of the phases of Venus establish?

Venus orbits the sun, which rules out Ptolemy's arrangement but not Tycho's

Correct

The earth orbits the sun

The answer is: Venus orbits the sun, which rules out Ptolemy's arrangement but not Tycho's

Venus orbits the earth

The answer is: Venus orbits the sun, which rules out Ptolemy's arrangement but not Tycho's

Venus is closer to the sun than Mercury is

The answer is: Venus orbits the sun, which rules out Ptolemy's arrangement but not Tycho's

3.[2p]
Venus is 1.72 AU away when full and 0.28 AU away when a thin crescent. By what factor should its apparent diameter change between those two moments?

CorrectNot quite: 6.1

4.[3p]
Callisto orbits Jupiter at 4.465 times Io's distance, and Io's period is 1.769 days. Using the third law, what is Callisto's period, in days?

CorrectNot quite: 16.7

5.[3p]
Which standing objections to a moving earth did the moons of Jupiter answer?

Select all that apply

That the earth must be the unique centre of all revolution

Correct

That a moving earth would leave its moon behind

Correct

That a moving earth would produce stellar parallax

The answer is: That the earth must be the unique centre of all revolution, That a moving earth would leave its moon behind

That heavy bodies fall towards the centre of the universe

The answer is: That the earth must be the unique centre of all revolution, That a moving earth would leave its moon behind

6.[3p]
How did Galileo argue that sunspots lie on the sun itself rather than being small bodies passing in front of it?

Spots are foreshortened into narrow ellipses near the edge of the disc, as marks on a rotating sphere would be

Correct

Spots are always the same size wherever they appear

The answer is: Spots are foreshortened into narrow ellipses near the edge of the disc, as marks on a rotating sphere would be

Spots can be seen with the naked eye at sunset

The answer is: Spots are foreshortened into narrow ellipses near the edge of the disc, as marks on a rotating sphere would be

Spots move faster near the edge of the disc than at the centre

The answer is: Spots are foreshortened into narrow ellipses near the edge of the disc, as marks on a rotating sphere would be

7.[1p]
Galileo invented the telescope, and no similar instrument existed before 1609.

True

The answer is: False

False

Correct

8.[3p]
Why was it reasonable, in 1610, to doubt what the telescope showed?

No account existed of how the instrument formed its image, and simple lenses do produce false appearances

Correct

The instruments were known to have been tampered with

The answer is: No account existed of how the instrument formed its image, and simple lenses do produce false appearances

Nobody else owned a telescope

The answer is: No account existed of how the instrument formed its image, and simple lenses do produce false appearances

Aristotle had explicitly forbidden the use of lenses

The answer is: No account existed of how the instrument formed its image, and simple lenses do produce false appearances

9.[3p]
What eventually made telescopic observations credible?

Select all that apply

The same objects were seen by different observers with different instruments

Correct

Positions of Jupiter's moons could be predicted in advance and then confirmed

Correct

The instrument gave checkable results on terrestrial targets

Correct

A mathematical proof that lenses cannot create false images

The answer is: The same objects were seen by different observers with different instruments, Positions of Jupiter's moons could be predicted in advance and then confirmed, The instrument gave checkable results on terrestrial targets

1.[3p] A lunar peak is lit while the surface around it is dark, at one twentieth of the moon's diameter from the terminator. With a lunar radius of 1737 km, how high is the peak, in kilometres?

2.[3p] What does the observation of the phases of Venus establish?

3.[2p] Venus is 1.72 AU away when full and 0.28 AU away when a thin crescent. By what factor should its apparent diameter change between those two moments?

4.[3p] Callisto orbits Jupiter at 4.465 times Io's distance, and Io's period is 1.769 days. Using the third law, what is Callisto's period, in days?

5.[3p] Which standing objections to a moving earth did the moons of Jupiter answer?

6.[3p] How did Galileo argue that sunspots lie on the sun itself rather than being small bodies passing in front of it?

7.[1p] Galileo invented the telescope, and no similar instrument existed before 1609.

8.[3p] Why was it reasonable, in 1610, to doubt what the telescope showed?

9.[3p] What eventually made telescopic observations credible?

1.[3p]
A lunar peak is lit while the surface around it is dark, at one twentieth of the moon's diameter from the terminator. With a lunar radius of 1737 km, how high is the peak, in kilometres?

2.[3p]
What does the observation of the phases of Venus establish?

3.[2p]
Venus is 1.72 AU away when full and 0.28 AU away when a thin crescent. By what factor should its apparent diameter change between those two moments?

4.[3p]
Callisto orbits Jupiter at 4.465 times Io's distance, and Io's period is 1.769 days. Using the third law, what is Callisto's period, in days?

5.[3p]
Which standing objections to a moving earth did the moons of Jupiter answer?

6.[3p]
How did Galileo argue that sunspots lie on the sun itself rather than being small bodies passing in front of it?

7.[1p]
Galileo invented the telescope, and no similar instrument existed before 1609.

8.[3p]
Why was it reasonable, in 1610, to doubt what the telescope showed?

9.[3p]
What eventually made telescopic observations credible?