Question

question 19
how many arcseconds are there in one degree?
60
120
10
6000
3600
question 20
objects a and b both have the same angular size, and object a is closer to us than object b. which of the following can we conclude?
object a is larger than object b.
object a is brighter than object b.

Explanation:

Step1: Recall angle - unit conversion

1 degree = 60 arc - minutes, 1 arc - minute = 60 arc - seconds.

Step2: Calculate arc - seconds in 1 degree

$60\times60 = 3600$ arc - seconds.

Answer:

3600

(Note: for Question 20, it seems incomplete as the options are cut - off. But based on the given Question 19, the above is the solution for it.)