A lens of focal length 40 mm is used as a magnifier. The object being viewed is 5.3 mm long, and is positioned at the focal point of the lens. The user of the magnifier has a near point at 25 cm. What is the angular magnification of the magnifier?
A) 6.3
B) 5.6
C) 6.9
D) 7.5
E) 8.1
A
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In the original Miller—Urey experiment it was assumed that carbon and nitrogen in the early atmosphere were present as
A) carbon dioxide (CO2 ) and nitrogen (N2) B) carbonates (CO3-) and nitrates (NO3-) C) methane (CH4 ) and ammonia (NH3) D) carbon and nitrogen atoms
How does the value of 
for the loop change?
A. The quantity increases. B. The quantity decreases. C. The quantity remains the same. D. One cannot determine the change from what is given.
You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down
A) Work is + on the way up and + on the way down. B) Work is + on the way up and - on the way down. C) Work is - on the way up and + on the way down. D) Work is - on the way up and - on the way down.
The sun's X-ray and ultraviolet light output is greater than what we would expect based on the photosphere's temperature
Indicate whether the statement is true or false