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3 years ago

In which national park in Florida is Fort Jefferson?

Geography

1 answer:

uranmaximum [27]3 years ago

4 0

Answer:

Dry Tortugas National Park

Explanation:

Constructed between 1845 and 1876, Fort Jefferson is a 19th-century third system coastal fortification that occupies the majority of Garden Key in the remote Dry Tortugas National Park in the Florida Keys. Fort Jefferson represents the highest achievements of nineteenth century American military architecture and civil engineering.

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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

4 0

3 years ago

The map shows the major rivers, mountain ranges, desert regions, and population densities in China. Mapping the distribution of

nata0808 [166]

Answer:

Explanation:

natural resource can be a reason someone moves somewhere

7 0

3 years ago

Adjust the opacity periodically on the zoomed in region so you can determine both the elevation and color of the rocks. The whit

8_murik_8 [283]

Answer:

upper portion (6000ft - 6500 ft)

Explanation:

From the information given:

This activity involves exploring the Zion National Park geology. To achieve this, we need to download the Zion file & open it in Gougle Earth. This is followed by setting the vertical exaggeration to 0.5 & the measurement to feet/miles. The perspective view is also changed to a map view. Now, as viewed in Gougle Earth, the upper portion which is white in nature appears to be steeper than the lower portions. To the Toquerville, the area towards it is remarkably flat with slight undulations.

4 0

3 years ago

What is the farthest distance a human has ever been from earth?

Stolb23 [73]

In distance, it's something like maybe 245,000 miles ... corresponding to the
several Apollo missions during which a Command and Service module entered
lunar orbit and swung around the back side of the moon with astronauts aboard.

The farthest from Earth that a human has ever gone and walked on solid ground
is roughly 238,000 miles, corresponding to the six Apollo missions that landed
six pairs of astronauts on the near side of the surface of the moon, between 1969
and 1972 .

7 0

3 years ago

Read 2 more answers

Can anyone help me with this African map test? Pleasee

Fiesta28 [93]

Answer:

1. Egypt

2. South Africa

3. Libya

4. Sudan

5. Kenya

6. Nigeria

7. ?

8. Rwanda

9. Arabian Sea

10. Strait of Gibraltar

11. I don't see it??

12. Sahara Desert

13. Sahel

14. Cape Town

15. ?

16. Lake Victoria

17. Atlantic Ocean

18. Indian Ocean

19. Mediterranean Sea

20. Niger River

21. Congo River

22. Nile River

23. Cairo

24. Pretoria

25. Mt. Kilimanjaro or Nairobi?

26. Lagos

27. I don't see 27??

28. Rabat

Explanation: I'm going to do some more research lol

3 0

2 years ago