A camera has a lens of focal length 50 mm and an f-number of 4.0 . What is the diameter of the lens?
a. 50 mm
c. 25 mm
b. 100 mm
d. 13 mm
D
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Possible equations (choose the correct one): ? =10^12/H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about
a. 8.9 billion years. b. 13 billion years. c. 16.6 billion years. d. 26 billion years. e. 74 billion years.
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 (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -320 x B) -470 x C) -240 x D) -300 x E) -190 x
_____ is the rich solution of organic molecules in Earth's first oceans
A) Organelle soup B) Nuclear soup C) Plasma soup D) Primordial soup
The fact that some satellites and planets have cratered surfaces supports the hypothesis that planets and satellites were bombarded by planetesimals.
Answer the following statement true (T) or false (F)