The Sun And Its Radiation Flashcards
On the Hertzsprung-Russell diagram, what is the sun classed as?
Main sequence star
If 2 photons have different energies, the higher energy will also have
A higher frequency
What causes granulation on the Sun’s photosphere?
Convection currents rising from the convection zone
Emission lines of an element lie at 600-700nm, what colour will show
Red
What is the name of the process through which nuckear fusion occurs?
The proton-proton chain
Explain the chemical makeup of deuterium
One proton and one neutron
What causes the earths aurora?
Charged particles from the Sun hitting the atmosphere
Why must telescopes designed to detect X-rays be placed on satellites rather than Earth?
The Earth’s atmosphere blocks all X-rays from space
If a star is moving towards Earth how will its light appear?
Blue-shifted
The peak emission wavelength of a distance star is half the peak emission wavelength of our sun, what does this imply about the temperature of the distant star?
It is twice the temperature of the sun
What is the order for the parts if the Sun moving from the inner to the outer?
Core, radiation zone, convection zone, photosphere
What part of the spectrum will a star that is 2500K emit?
Infrared
When is an emission line formed?
When a hot gas emits light
Over the course of a sunspot cycle, when do sunspots appear?
First at mid latitudes and then near the equator
What is the balance between gas pressure and gravitational pull in the Sun known as?
Hydrostatic equilibrium
What is the final step in the proton-proton chain?
Two helium-3 nuclei fuse to mask a helium-4 and 2 protons
What is the relationship between the speed of light, wavelength and frequency?
c = f x lambda
What is granulation on the Sun’s surface evidence of?
Convection currents
What are the visible lines that hydrogen emit a part of?
The Balmer series
What is true about the Sun’s corona?
A - the corona is slightly cooler than the chromosphere
B - the corona is a string source of x-rays
C - the corona is the innermost region of the Sun’s atmosphere
D - the corona is about 10 times hotter than the suns core
B
How often does the solar minimum occur?
Every 11 years
What is the hottest place in the solar system?
Nuclear fusion experiments on Earth
What do fusion reactions in the suns core produce that are not elements ?
Neutrinos, positrons, electrons, protons
If the Sun were moving away from Earth what would happen to the spectrum of the Sun?
Red-shift
