Two flat glass plates are in contact along one end and are separated by a sheet of tissue paper at the other end. A monochromatic source of wavelength 427 nm illuminates the top plate. If 11 dark bands are counted across the top plate, what is the paper thickness? (1 nm = 10?9 m)
a. 4.3E–6 m
b. 1.7E–6 m
c. 2.1E–6 m
d. 2.6E–6 m
e. 1.3E–6 m
c
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What is the primary difference between an ideal emf device and a real emf device?
a) The electric potential of a real emf device is limited. b) The resistance of a real emf device is finite, but the resistance of an ideal emf device is assumed to be infinite. c) A real emf device can carry an electric current, but an ideal emf device does not. d) A real emf device has an internal resistance, but an ideal emf device does not.
The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?
A. In the H-R diagram, Aldebaran is above and to the left of the Sun. B. Aldebaran is cooler than the Sun, but has larger diameter than the Sun. C. Aldebaran is a binary star. D. Aldebaran is hotter and much more massive than the Sun. E. None of these choices is correct.
Isotropy is the observation that, in its general properties, the Universe looks different in every direction
Indicate whether the statement is true or false
Why is the night sky dark?
A) Dark matter obscures light from distant objects. B) The dust clouds in interstellar space block the light. C) The universe has a physical edge, beyond which there is nothing. D) The universe is finite in age.