Question 1

1. Venus, earth Jupiter

2. moons

3. a star can emit light, it undergoes fusion reactions in the core

4. The Big Bang theory states that the universe began from a single hot, dense point and is a continuous expansion of space. It supports these observations because it states that the universe was smaller before and galaxies are moving apart with greater speed which imply that the universe is expanding.

5. • = simplifies big numbers and reduces the need for scientific notation
   • = there is inconsistency with the other areas of physics

Question 2

1. p = 6, n = 8
2. beta decay, anti neutrino
3. 5500 years
4. 13,000 years
5. The graph above shows that at 40,000 years, the % of carbon-14 atoms is almost 0. This means that carbon-14 dating cannot prove the claim about dinosaur bones being over 65 million years old since it would be too small of a sample to detect or measure accurately.

Question 3

1. light energy, 95J

2. voltmeter parallel to LED, ammeter in series to LED

3. P = VI

   P = 0.05 x 1

   = 0.05W

4. Filament = 5%

   LED = 0.02/0.05 = 40%

   The LED is more efficient than the filament bulb

Question 4

1. How does the drop height affect the height of the first bounce of the ball?

2. IV: drop height

   DV: height of first bounce

   CV: everything else