1. Unit 3 Practice Test Answer KEY
Check your answers after you have completed your practice test.
Look over your answers.
Go back through the practice test and review the questions that you missed.

2. A1
Red

3. A2
Star moving away from Earth

4. A3
The Hubble telescope is above the Earth’s atmosphere

5. A4
The blue star is hotter because blue light has a higher energy

6. A5
5000 mm

7. A6
Color

8. A7
Each element has a different emission line

9. A8
Absorbs any hydrogen emission lines

10. A9 A

11. A10
Telescope A would produce brighter images

12. A11
Visible light

13. A12
Radio waves

14. A13
Infrared

15. A14
Gamma rays

16. A15
Visible waves

17. A16
E all are types of telescopes

18. A17
The star’s spectrum is redshifted and the star is moving away from us.

19. A18
Radio telescope

20. A19
The resolution of the images

21. A20
By comparing the absorption lines to the emissions lines of other elements

22. A21
Use a shorter focal length eyepiece

23. A22
Radio waves

24. A23
Composition of the star

25. A24
500 mm

26. A25
1. A
2. D
3. C
4. B
5. A

27. A26
Reflector telescope

28. A27
1/25 as bright

29. A28
250x

30. A29
CCD’s convert light into digital information to be analyzed

31. A30 They have different wavelengths
They all travel at the speed of light
They can travel through empty space
They have different energies

32. A31
Use a longer focal length eyepiece

33. A32
Refracting telescopes gather and bend light toward the focus of the lens
Reflecting telescope use a mirror system to bounce light off the primary mirror toward the secondary mirror

34. A33
A photon is released

35. A34
Motion towards or away from the observer