1- During solar eclipses, solar prominences are often seen extending 6 minutes o

Question

1- During solar eclipses, solar prominences are often seen extending 6 minutes of arc or 1/10 of a degree from the edge of the sun's disk. Knowing that the sun is about 1/2 of a degree in angular size in the sky and that it is about 100 times Earth's diameter in kilometers, how far does a large prominence extend, in Earth diameters?

a. 1/10

b. 200

c. 6

d. 20

e. 300

2. If the apparent visual magnitude of the sun is -26.74 and that of the full moon is -12.74 , what is the light flux ratio of sunlight to full moonlight received by Earth?

a. 4000

b. 40

c. 10,000

d. 400,000

e. 100

For a latitude of 30° north, what is the angle between the southern horizon and the noon sun at the summer solstice?

a. 90° – 30° + 23.4°

b. 30° – 23.4°

c. 30° + 23.4°

d. 90° + 30° + 23.4°

Imagine you're an astronaut standing on the moon and looking back at Earth.

What phase would Earth have when the moon is new as seen by an Earth observer?

a. first quarter

b. New

c. Full

d. Third quarter

Explanation / Answer

Ans- 1 d

Sun diameter 1,392,000 km

Angular Size- 32.7 Arc minutes

Size per aArc Minute= 1392,000/32.7

Area of 6 Arc Minutes= 6*(1392000/32.7)

=255,412.84

Comparing with earth's diameter

Ans- 2- D

Ans- 3-a

This is based on the formula for sun's inclination

Ans- 4- C

Full, It must be noted that the earth and Moon phases compliment each other.

Ans- 4

= 255,412.84/12756 (earth's equatorial diameter)

=20

2-

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