1.6 Using radiation to investigate stars Flashcards
(17 cards)
What is an Emission Spectrum?
Continuous spectrum of electromagnetic radiation from stars.
What is an Absorption Spectrum?
Line spectrum produced when radiation passes through gas.
What is a Black Body?
Ideal absorber of all incoming radiation.
What does Wien’s Displacement Law state?
Peak wavelength inversely proportional to absolute temperature.
What is Absolute Temperature?
Temperature measured in kelvin (K).
What is the Wien’s Law Equation?
wavelength (λ) = Wiens constant / temperature in degrees K (T)
What is Luminosity?
Total power emitted by a star.
What is the Stefan’s Law Equation?
L = σAT^4, relates luminosity, area, and temperature.
What is the Inverse Square Law?
Intensity inversely proportional to squared distance.
I=P/4πr²
What is the Intensity equation?
Intensity = Power / 4πr²
What is Peak Wavelength?
Wavelength at which emission intensity is highest.
How do you calculate Surface Temperature?
T = Wiens constant/λmax, finds temperature from peak wavelength.
What is Multiwavelength Astronomy?
Observing non-visible radiation to study celestial bodies.
What are Pulsars?
Neutron stars emitting radio waves in pulses.
What are Gamma Rays?
High-energy radiation beyond visible spectrum.
What is Infrared Radiation?
Longer wavelength radiation not visible to the eye.
What is Ultraviolet Radiation?
Shorter wavelength radiation beyond visible light.
