Meten aan licht (3) Flashcards

1
Q

Golfvergelijking EM straling

A

E = E_o* cos(kx - ωt)
- k = 2π/λ
- ω = 2π/P

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2
Q

Zichtbaar licht

A

400 nm (violet) –> 750 nm (rood)

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3
Q

Zwart lichaam

A

Produceert continuümstraling (in vorm van thermische straling)
- Hoe hoger T, hoe meer kortgolvige straling
(bij gewone straler)

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4
Q

Spectrum

A

Verdeling van stralingsflux (emissie en absorbtie verdeling)

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5
Q

Wet van Kirchhof

A

Bij golflengtes waar het lichaam straling beter absorbeert is de thermische straling ook sterker. Rood opp. straalt dus minder rode thermische straling uit.

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6
Q

Waardoor wordt spectrum zwart-lichaamsstraling weergeven

A

Plankfunctie –> Hoe hoger temp, hoe hoger stralingsintensiteit, piek verschuift naar links (λ wordt kleiner)

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7
Q

Totale vermogen opp

A

B = σT^4

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8
Q

Lichtkracht van bolvormige ster

A

L = 4πR^2σT^4
4πR^2 = opp bol

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9
Q

Schijnbare magnitude

A

m = - 2.5log(f/f_o)
m1 - m2 = -2.5log(f1/f2)

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10
Q

Afstandsmodule (m.b.h. absolute mag.)

A

m- M = 5log(d) - 5

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11
Q

Afstandsmodule (m.b.h. absolute mag.)

A

m- M = 5log(d - 5)

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12
Q

Absolute magnitude

A

M = -2.5log(f / f10)
- f10 is flux op 10 pc afstand

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13
Q

Verschil emissielijnen en absorptielijnen gaswolk

A

Absortielijnen zijn veel continuër dan die van de emissielijnen.

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14
Q

Non-realitivistische doppler

A

λ/λ0 = vr/c
–> vr > 0 betekent beweging van ons af
en dus roodverschuiving

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