By what process do nuclear power plants on the Earth generate energy?
A) converting gravitational potential energy into electricity
B) nuclear fission
C) converting kinetic energy into electricity
D) chemical reactions
E) nuclear fusion
B
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What is the wavelength of the longest wavelength light that can be seen with the human eye?
a. 400 nm b. 4000 nm c. 7000 nm d. 700 nm e. 3×10^8 m
The objective and the eyepiece of a microscope have focal lengths of 4.00 mm and 25.0 mm, respectively
The objective produces a real image 30 times the size of the object. The final image is viewed at infinity, and the near point of the microscope user is at 25.0 cm. What is the distance between the object and the focal point of the objective? A) 0.13 mm B) 0.18 mm C) 0.23 mm D) 0.28 mm E) 0.33 mm
The loop is entirely inside the field.
A. Current flows clockwise in the loop. B. Current flows counterclockwise in the loop. C. Current does not flow in the loop.
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore,
A) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A. B) both stars have the same apparent brightness, but the luminosity of Star B is four times that of Star A. C) both stars have the same luminosity, but the apparent brightness of Star A is four times that of Star B. D) both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.