An interstellar dust cloud may be very cold. What kind of telescope would we use to observe it at its strongest wavelength?
A. a space-based ultraviolet telescope
B. a ground-based visible-light telescope
C. a ground-based infrared telescope
D. a ground-based X-ray telescope
E. None of these choices are correct.
Answer: E
You might also like to view...
Compared to the size of the Sun, stars of all types range from
A) 0.5 to 50 solar radii. B) 0.1 to 10 solar radii. C) 0.01 to 1,000 solar radii. D) 0.08 to 8,000 solar radii. E) 0.001 to 50,000 solar radii.
The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a person 25 m away. In what direction must the lens be moved to change the focus of the camera to a person 4.0 m away?
A) It does not make any difference. B) sideways from the CCD sensors C) away from the CCD sensors D) towards the CCD sensors
A student weighing 200 N climbed a flight of stairs 9.0 m high in 4 s. How much work was done by the student?
a. 1800 J b. 800 J c. 1800 W d. 800 W e. 50 W
Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus. B) They have different atomic mass numbers. C) They have different numbers of electrons. D) They have different names.