Astro 1
Betelgeuse is a red supergiant in the constellation of Orion. Predict what it will most likely become at the end of its life.
A black hole
It takes 730 years for a light signal from the Jupiter to reach Galaxy RL. State how far Galaxy RL is from Jupiter in light-years.
730 LY
The current estimate for Hubble constant is 2.25 x 10^-18 /s. Using this value, calculate the approximate age of the universe.
4.4 x 10 ^17 s
The Moon is a natural satellite of the Earth. State the Moon's approximate orbital period around the Earth. Give your answer in days
27-29 days
What is the equation for Snell's Law?
n1sinθi = n2sinθr
The Sun radiates its energy in the form electromagnetic waves. Most of its emitted lights are in which region of the spectrum?
Infrared, visible light, ultraviolet
Galaxy Linden is 430 light years away from the Earth. Determine how far Galaxy Linden is from Earth in meters.
4.1 x 10^18 meters
How can the speed of the receding universe be measured?
Supernovae Type IA
The gravitational field strength of Saturn ___________ as the distance from Saturn increases.
Decreases
Transverse: Matters move perpendicular to the propagation of energy
Longitudinal: Matters move parallel to the propagation of energy
Why is the observed universe usually red in color when observed from the telescope from Earth?
Due to Redshift
Arno Penzias and Robert Wilson discovered radiation with specific frequency. The radiation that now fills all points in space was produced shortly after the Universe was formed. What is the full name of the radiation?
Cosmic Microwave Background Radiation (CMBR)
Planet DJ in another galaxy has an orbital period of 230 Earth years and an orbital speed of 8.10 x 10 ^5 m/s. Determine the average radius of its orbital path.
9.35 x 10 ^14 m
State two conditions for a reflection.
2. Incident angle higher than critical angle
Mercury is the closest planet to the Sun.
Its average distance from the Sun is 5.8 × 10^10 m and it takes 0.24 years to completely revolve around the Sun.
Calculate the average orbital speed of Mercury in metres per second.
4.8 × 10^4 m/s
Which statement describes the relationship between the gravitational field strength at the surface of a planet and the mass of the planet?
The greater the mass, the stronger the gravitational force, thus, the stronger the gravitational field strength.
Explain what type of radiation will CMBR change into over the next billion of years.
CMBR will undergo further redshift and turn into radio part of the spectrum.
Planet Z in another galaxy has an orbital period of 110 Earth years and an orbital speed of 6.60 × 10^5 m/s.
Determine the average radius of its orbital path.
Give your answer in the form ax10^b.
3.64 x 10^14 m
The light travels from water to air. The incident angle is 45°. What is the critical angle and will the light refract or reflect?
Critical angle is 60°
The light will refract
The Sun burns ___________ of hydrogen each second. The Sun is about 150,000,000 km away from the Earth. If the Sun disappeared at this exact moment, calculate the time it would take us to realize that it had disappeared.
600 million tons, 500 seconds
If an infrared signal is sent to Proxima Centauri (4.24 ly away) determine the approximate time in days for the signal to reach the star. (1 year =365 days)
(time to reach star) = 4.24 years (since it is 4.24ly away)
4.24 x 356 =1,509.44 1548 days.
What is the temperature of the universe? How does this compared to the temperature of hot gases in large-scale structures like galaxies?
2.75 Kelvin , 2 million Kelvin
Galaxy Z is a distance 2.34 × 10^24 m from Earth and is receding at a speed of 5500 km/s.
Calculate the value of H0.
Give your answer in the form ax10^b.
2.4x10^-18
A wave generator at one end of a ripple tank is creating waves with a frequency of 10 Hz. A flat piece of plastic is placed diagonally at the other end of the ripple tank which makes the water shallower. Describe what happens to the waves passing above the flat plastic.
The waves travel more slowly, and they change direction.