The ____________________ of a telescope is determined by the size of the primary lens or mirror

Fill in the blank(s) with correct word


light-gathering power

Physics & Space Science

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One end of a copper rod is in thermal contact with a hot reservoir at T = 500 K and the other end is in thermal contact with a cooler reservoir at T = 300 K. Find the entropy change of each reservoir, and the total entropy change, when 8000 J of heat energy are conducted from one end of the rod to the other with no change in the temperature distribution in the rod.

What will be an ideal response?

Physics & Space Science

So which is closer?

A: Menkent B: Hadar C: Can't tell

Physics & Space Science

The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?

a. luminosity versus spectral type b. luminosity versus temperature c. radius versus temperature d. absolute magnitude versus temperature e. luminosity versus color

Physics & Space Science

The Sun will one day pass through the instability strip and become a variable star

a. True b. False Indicate whether the statement is true or false

Physics & Space Science