Approximate Values

Question 1

Distance from the Earth to the most remote known quasar

Answer 1

1.4×10²⁶

Question 2

Distance from the Earth to the most remote normal galaxies

Answer 2

9×10²⁵

Question 3

Distance from Earth to the nearest large galaxy (M 31, the Andromeda Galaxy)

Answer 3

2×10²²

Question 4

Distance from the Sun to the nearest star (Proxiama Centauri)

Answer 4

4×10¹⁶

Question 5

One Lightyear

Answer 5

9.46×10¹⁵

Question 6

Mean orbit radius of Earth about the Sun

Answer 6

1.50×10¹¹

Question 7

Mean distance from Earth to the Moon

Answer 7

3.84×10⁸

Question 8

Distance from the equator to the North Pole

Answer 8

1.00×10⁷

Question 9

Mean radius of the Earth

Answer 9

6.37×10⁶

Question 10

Typical altitude (above the surface) of a satelite orbiting the Earth

Answer 10

2×10⁵

Question 11

Length of football field

Answer 11

9.1×10¹

Question 12

Length of housefly

Answer 12

5×10^-3

Question 13

Size of smallest dust particle

Answer 13

~ 10^-4

Question 14

Size of cells of most living organisms

Answer 14

~ 10^-5

Question 15

Diameter of hydrogen atom

Answer 15

~ 10^-10

Question 16

Diameter of an atomic nucleus

Answer 16

~ 10^-14

Question 17

Diameter of a proton

Answer 17

~ 10^-15

Question 18

Proton

Answer 18

1 amu = 1.6605×10²⁴

Question 19

Electron

Answer 19

0.5 amu

Question 20

Neutron

Answer 20

1 amu

Question 21

Recommended dosage of drug intake

Answer 21

3 mg of drug / 1 kg of body weight

Question 22

Hydrogen-3 (Tritium)

Answer 22

12.26 years

Question 23

Carbon-14

Answer 23

5730 years

Question 24

Phosphorus-28

Answer 24

0.28 seconds

Question 25

Phosphorus-32

Answer 25

14.3 days

Question 26

Potassium-40

Answer 26

1.28×10⁹ years

Question 27

Scandium-42

Answer 27

0.68 seconds

Question 28

Cobalt-60

Answer 28

5.2 years

Question 29

Strontium-90

Answer 29

28.1 years

Question 30

Technetium-90

Answer 30

6.0 hours

Question 31

Indium-116

Answer 31

14 seconds

Question 32

Iodine-131

Answer 32

8 days

Question 33

Mercury-197

Answer 33

65 hours

Question 34

Polonium-210

Answer 34

138 days

Question 35

Radon-205

Answer 35

2.8 minutes

Question 36

Radon-222

Answer 36

2.8 minutes

Question 37

Uranium-238

Answer 37

4×10⁹ years