The term observable universe refers to ________
A) the portion of the universe that is not hidden from view by, for example, being below the horizon
B) that portion of the universe that we have so far photographed through telescopes
C) that portion of the universe that we can see in principle, given the current age of the universe
D) the portion of the universe that can be seen by the naked eye
C
You might also like to view...
Which of the following are in order of decreasing temperature?
A) O9, F2, F7, G2, K0 B) K0, G2, F7, F2, O9 C) F7, F2, O9, K0, G2 D) O9, F7, F2, G2, K0
The focal length of the objective lens of a telescope is 75.0 cm, and the eyepiece has a focal length of 6.00 cm. What is the magnification of this telescope?
A) 0.0800 B) 0.645 C) 450 D) 12.5 E) 200
In this figure, 10 calories of heat are added to each of the two samples of the same gas. Why is T1 greater than T2?
a. There are fewer atoms or molecules in the smaller object, so each atom (molecule) must move more vigorously for a given amount of heat (energy) transferred to the material. b. The thermometer is able to absorb heat from the smaller object more rapidly. c. This follows from the ideal gas law.
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with
the eyepiece adjusted for minimum eyestrain. The near-point distance of the person using the microscope is 25.0 cm. What is the final magnification of the microscope? A) -190 B) -240 C) -300 D) -310 E) -470