On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie
A) at the top left.
B) at the top right.
C) close to the Sun, near the center.
D) at the lower left.
E) at the lower right.
D
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A mercury thermometer has a bulb of volume 0.100 cm3 at 10.°C. The capillary tube above the bulb has a cross-sectional area of 0.012 mm2
The volume thermal expansion coefficient of mercury is 1.80 × 10-4 K-1. How much will the mercury rise when the temperature rises to 30.°C?
Which of the following provides evidence that light is made of waves?
A) The individual dots seen on a photographic plate when a photo is taken at extremely short exposure times B) Interference effects seen when light passes through a narrow opening C) Both of the above. D) Experiments that spread light out into a spectrum of colors E) All of the above.
Which spacecraft did NOT visit Saturn?
A. Pioneer B. Voyager 2 C. mariner 10 D. Galileo
When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference? Select one:
a. one-fourth of a wavelength
c. one wavelength
b. half a wavelength
d. one and a half wavelengths