Test #2

Question 1

What is the general principle of a telescope?

Answer 1

It uses an Objective (lens or mirror) to form an image and uses an eyepiece (set of lenses) to magnify it

Question 2

Two main types of telescopes and what differentiates them?

Answer 2

Refractor (Objective is a lens)

Reflector (Objective is a mirror)

Question 3

What are the three powers of a telescope

Answer 3

Light-Gathering Power (Gather more light to see further objects)
Resolving Power (Ability to see details)
Magnifying Power (Abilty to make objects look bigger)

Question 4

What are all the kinds of Electromagnetic waves In order of increasing power ?

Answer 4

Radio Waves
Microwaves
Infrared
Visible
Ultraviolet
X-Rays
Gamma rays

Question 5

Examples and characteristics of Terrestrial planets

Answer 5

Mercury, Venus, Mars and Earth
Rocky Planets
Lost most of their atmosphere (H, He)
They are hotter and smaller gravity

Question 6

Examples and characteristics of Jovian Planets

Answer 6

Jupiter, Saturn, Uranus and Neptune
Gaseus Giants
Made of H and He
Cold and have many satellites
Rotate very fast

Question 7

What is special about Pluto

Answer 7

Looks like a terrestrial planet but very cold
Very elliptical orbit
Orbir more inclined
Member of the Kuiper Belt

Question 8

Where can we find the different types of Asteroids and Comets (All made of rock and ice)

Answer 8

Asteroids : Between Mars and Jupiter
Kuiper belt Objects : Beyond Neptune
Comets : Oort’s cloud

Question 9

Interresting characteristics of he Moon

Answer 9

Very large compared to the planet
Shows many craters
Smaller density than the Earth
No metallic core, almost no magnetic field

Question 10

Interresting charasteristics of Io

Answer 10

Smallest of the Galilean moons of Jupiter
Covered by Lava (Active volcanoes)
Heated up by the tidal forces exerted by Jupiter

Question 11

Interresting charasteristics of Europa

Answer 11

Galilean moon of Jupiter
Covered by Ice
Probably has a liqued ocean underneath the ice
Probable Extraterrestrial life

Question 12

Interresting charasteristics of Ganymede

Answer 12

Largest of the Galilean Moons

Question 13

Interresting charasteristics of Titan

Answer 13

Largest moon of Saturn
Rocky surface and thick atmosphere
Atmosphere mostly of Nitrogen
Similar to the early Earth

Question 14

Interresting charasteristics of Triton

Answer 14

Neputine Satellite
Retrograde motion
Geysers of boiling liquid Nitrogen
Kuiper belt object captured by Neptune

Question 15

What determines the average temperature of a planet

Answer 15

Its distance from the sun

Question 16

What’s the Greenhouse effect?

Answer 16

An atmosphere that prevents some radition to escape

Question 17

What is Brightness?

Answer 17

Rate at which we receive energy

Question 18

What is luminosity?

Answer 18

Rate at which a star emits energy

Question 19

What is the full sequence of spectral types?

Answer 19

OBAFGKM

Question 20

What are the shift color when the star moves?

Answer 20

Red shift when it moves away

Blue shift when it approaches

Question 21

What has the shortern lifetime : High mass or low mass stars

Answer 21

High mass Stars

Question 22

What does a star become when it runs out of fuel?

Answer 22

A Giant or a Supergiant

Question 23

Charateristics of Large Stars?

Answer 23

Luminous
Hot
Large radius

Question 24

Characteristcs of Small Stars?

Answer 24

Cool
Not luminous
Small radius

Question 25

What is the source of energy for a Main Sequence Star?

Answer 25

Fusion of hyrdrogen into helium in the central core

Question 26

Why does the fusion of H into He releases energy? (Nuclear Fision)

Answer 26

The mass of an He nucleus is smaller than that of the original four H nuclei added together (loss of mass = energy released)

Question 27

How does Nuclear fission releases energy?

Answer 27

Increases the binding energy per nucleon