When sign painters Burl and Paul stand on opposite ends of a scaffold, the tensions in each of the two supporting ropes
A) are equal.
B) depend on the relative weights of Burl and Paul.
C) combine to equal zero.
D) none of the above
Answer: B
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Single-Slit Diffraction: Light of wavelength 610 nm is incident on a slit 0.20 mm wide and the diffraction pattern is viewed on a screen that is 1.5 m from the slit. What is the width on the screen of the central maximum?
A. 0.34 cm B. 0.68 cm C. 0.92 cm D. 1.2 cm E. 1.5 cm
The mean free path for a nitrogen molecule in a tank of dry nitrogen at 273 K is 0.15 ?m. If the diameter of a nitrogen molecule is 0.29 nm, what is the pressure in the tank?
A. 95.1 kPa B. 48 kPa C. 211 kPa D. 299 kPa E. 67.2 kPa
Why do we see a gravitational redshift in the spectrum of the Sun?
A) Gravity makes light heavy, causing it to appear redder. B) Because of gravity, the Sun is always moving away from us, so we see a redshift. C) Time runs slower on the Sun than on Earth, making lines in the solar spectrum have lower frequency and hence longer wavelength than normal. D) Spacetime curvature allows red photons of light to escape the Sun more easily than blue photons, leading to an apparent redshift.
Single convex spherical mirrors produce images that
A) are always smaller than the actual object. B) are always larger than the actual object. C) are always the same size as the actual object. D) could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object. E) are sometimes real.