What are stars made of?

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How do they know what stars are made of? Waves Spectrography Planet X The Earth

Transcript of What are stars made of?

Page 1: What are stars made of?

How do they know what stars

are made of?Waves

Spectrography

Planet X

The Earth

Page 2: What are stars made of?

Waves

• Wavelength(λ): distance between consecutive crests

• Frequency (f): number of oscillations per second

• v = λ·f

• c = λ·f (electromagnetic wave)

fhE

cf

Page 3: What are stars made of?

Electromagnetic spectrum

Page 4: What are stars made of?

Electromagnetic spectrum

Page 5: What are stars made of?

Electromagnetic spectrum

Page 6: What are stars made of?

Spectrography

• White light is

made up of all the

colors of the

visible spectrum.

• Passing it through

a prism separates

it.

Page 7: What are stars made of?

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.

Page 8: What are stars made of?

Emission & absorption spectra

continuous spectrum

absorption spectrum

emission spectrum

hot source

gas

Page 9: What are stars made of?

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

Page 10: What are stars made of?

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

Page 11: What are stars made of?

Planet X

• What are planet X atmosphere made of?

Hydrogen

HelioHelio

Helium

Page 12: What are stars made of?

Planet X

• What are planet X atmosphere made of?

Sodium

HelioHelio

Carbon

Page 13: What are stars made of?

Planet X

• What are planet X atmosphere made of?

Chlorine

HelioHelio

Oxígeno

Page 14: What are stars made of?

Planet X

• What are planet X atmosphere made of?

Nitrogen

HelioHelio

Oxygen

Page 15: What are stars made of?

The Earth

• Which is the Earth atmosphere spectrum?

Nitrogen

HelioHelio

Oxygen

Earth 1

Page 16: What are stars made of?

The Earth

• Which is the Earth atmosphere spectrum?

Nitrogen

HelioHelio

Oxígeno

Earth 2

Page 17: What are stars made of?

The Earth

• Which is the Earth atmosphere spectrum?

Nitrogen

HelioHelio

Oxygen

Earth 4

Page 18: What are stars made of?

The Earth

• Which is the Earth atmosphere spectrum?

Nitrogen

HelioHelio

Oxygen

Earth 3