How does the energy of a water wave differ from the energy of a photon?
What will be an ideal response?
Amplitudes of sound (and water) waves can differ greatly and still have the same wavelength and frequency, as they are the result of the motions of large numbers of molecules. For photons, the energy is quantized, so that each photon of a given wavelength must carry the same amount of energy.
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The Moon has an angular diameter of 0.5°. What is the Moon's angular diameter in minutes of arc?
a. 0.5 b. 30 c. 50 d. 1800 e. 60.5
What is the charge on 1.0 kg of protons?(e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A) 1.0 C B) 1000 C C) 9.6 × 107 C D) 6.0 × 1026 C E) 6.0 × 1023 C
Where does a 1-solar-mass protostar appear on an H-R diagram?
A) to the right of the main sequence, and lower down than the Sun B) to the right of the main sequence, and higher up than the Sun C) to the left of the main sequence, and higher up than the Sun D) Nowhere—only stars that have fusion in their cores can be shown on H-R diagrams.
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s?
a. 3.0 rev/s b. 1.5 rev/s c. 0.48 rev/s d. 0.24 rev/s