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3 years ago

Please help! Will mark brainlist

Geography

2 answers:

lisov135 [29]3 years ago

5 0

It’s d because that’s the only thing they didn’t do

Jlenok [28]3 years ago

4 0

Answer:

Explanation:

i think lol

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Imagine that you have obtained spectra for several galaxies and have measured the observed wavelength of a hydrogen emission lin

Lerok [7]

Answer:

A. z (galaxy 1) = -0.00515, z (galaxy 2) = -0.01707, z (galaxy 3) = -0.04008

B. v (galaxy 1) = -0.00517c, v (galaxy 2) = -0.01707c, v (galaxy 3) = -0.0401c

C. d (galaxy 1) = -21 Mpc,d (galaxy 2) = -69.4 Mpc, d (galaxy 3) = -163 Mpc

Explanation:

We begin by listing out the parameters we were given:

λ (obsv) = 656.3 nm, λ (emit 1) = 659.7 nm, λ (emit 2) = 667.7 nm,

λ (emit 3) = 683.7 nm

A) Using the Redshift formula, we have:

z = [λ (obsv) - λ (emit)] ÷ λ (emit)

For galaxy 1:

z = [λ (obsv) - λ (emit 1)] ÷ λ (emit 1)

z = (656.3 - 659.7) ÷ 659.7 = -0.00515

z = -0.00515

For galaxy 2:

z = [λ (obsv) - λ (emit 2)] ÷ λ (emit 2)

z = (656.3 - 667.7) ÷ 667.7 = -0.01707

z = -0.01707

For galaxy 3:

z = [λ (obsv) - λ (emit 3)] ÷ λ (emit 3)

z = (656.3 - 683.7) ÷ 683.7 = -0.04008

z = -0.04008

B) Using the Doppler formula, we have:

(Δλ ÷ λ) = v ÷ c

v = c * (Δλ ÷ λ)

but, z = (Δλ ÷ λ)

⇒ v = c * z

speed of light (c) = 3 x $10^{8}$ m/s

For galaxy 1:

v = c * z

Substitute z into the equation calculated from A) above

v = 3 x $10^{8}$ * (-0.00515)

v = -1.55 x $10^{6}$ m/s

v = -0.00517c

For galaxy 2:

v = c * z

Substitute z into the equation calculated from A) above

v = 3 x $10^{8}$ * (-0.01707)

v = -5.12 x $10^{6}$ m/s

v = -0.01707c

For galaxy 3:

v = c * z

Substitute z into the equation calculated from A) above

v = 3 x $10^{8}$ * (-0.04008)

v = -12.03 x $10^{6}$ m/s

v = -0.0401c

N.B: the negative value of velocity connotes that the galaxies are moving away from us (not towards us)

C) Using Hubbleʹs law, we have:

v = H · d

where:

v = velocity of a galaxy (km/s), d = distance (Mpc),

H = Hubble's constant (km/s/Mpc) = 73.8 km/sec

d = v ÷ H

We use the velocities calculated in B) above

For galaxy 1:

v = -1.55 x $10^{3}$ km/s

d = -1.55 x $10^{3}$ ÷ 73.8

d = -21 Mpc

For galaxy 2:

v = -5.12 x $10^{3}$ km/s

d = -5.12 x $10^{3}$ ÷ 73.8

d = -69.4 Mpc

For galaxy 3:

v = -12.03 x $10^{3}$ km/s

d = -12.03 x $10^{3}$ ÷ 73.8

d = -163 Mpc

N.B: distance cannot be a negative value

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3 years ago

All of the following are environmental costs of relying on sanitary landfills for waste handling EXCEPT:_____.

Kobotan [32]

Answer:

The answer is letter B

Explanation:

the release of fly ash into the atmosphere. Because pollution control standards now require that it be captured prior to release by fitting pollution control equipment.

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4 years ago

How deep is the deepest part of the ocean?

Alekssandra [29.7K]

Answer:

36,200 feet deep

Explanation:

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3 years ago

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What geographic feature is indicated by #10?

garik1379 [7]

Answer:

Zagros Mountains

Explanation:

The Zagros Mountains are one of the most dominant geographic features in the Middle East. This mountain range has length of roughly 1,600 km. There are three countries through which the Zagros Mountains are stretching, those being Turkey, Iraq, and Iran. The majority of the Mountain range runs through Iran, making up big portion of the border with Iraq, as well as being a natural barrier at the southern coast of the country.

These mountains have elevation of over 4,400 meters above see level. They are responsible for the dry climate in Iran, as they are a big natural barrier for the air masses, so they create a rain shadow, making the interior of Iran very dry.

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4 years ago

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Factors of 110 by Prime Factorization
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