What are stars made of?
-
Upload
ies-universidad-laboral -
Category
Science
-
view
345 -
download
4
Transcript of What are stars made of?
How do they know what stars
are made of?Waves
Spectrography
Planet X
The Earth
Waves
• Wavelength(λ): distance between consecutive crests
• Frequency (f): number of oscillations per second
• v = λ·f
• c = λ·f (electromagnetic wave)
fhE
cf
Electromagnetic spectrum
Electromagnetic spectrum
Electromagnetic spectrum
Spectrography
• White light is
made up of all the
colors of the
visible spectrum.
• Passing it through
a prism separates
it.
Non white light
• By heating a gas or
with electricity we
can get it to give off
colors.
• Passing this light
through a prism
does something
different.
Emission & absorption spectra
continuous spectrum
absorption spectrum
emission spectrum
hot source
gas
Bohr model
• Electrons exist only in orbits with specific amounts of energy called energy levels
• Therefore…– Electrons can only gain or
lose certain amounts of energy
– Only certain photons are produced
– Energy of photon depends on the difference in energy levels
1
23
45
6
nucleus
Hydrogen spectrum
A B C D E F
Lyman series (UV)
A B D E
Balmer (Visible)
A B C D
Paschen (IR)
E1
E2
E3
E4
E5
E6
Ene
rgy
IRregion
UVregion
656 nm
486 nm
434 nm
410 nm
ionization
Planet X
• What are planet X atmosphere made of?
Hydrogen
HelioHelio
Helium
Planet X
• What are planet X atmosphere made of?
Sodium
HelioHelio
Carbon
Planet X
• What are planet X atmosphere made of?
Chlorine
HelioHelio
Oxígeno
Planet X
• What are planet X atmosphere made of?
Nitrogen
HelioHelio
Oxygen
The Earth
• Which is the Earth atmosphere spectrum?
Nitrogen
HelioHelio
Oxygen
Earth 1
The Earth
• Which is the Earth atmosphere spectrum?
Nitrogen
HelioHelio
Oxígeno
Earth 2
The Earth
• Which is the Earth atmosphere spectrum?
Nitrogen
HelioHelio
Oxygen
Earth 4
The Earth
• Which is the Earth atmosphere spectrum?
Nitrogen
HelioHelio
Oxygen
Earth 3