The prediction of special relativity that moving clocks run slow is
a. time dilation.
b. length contraction.
c. the equivalence of mass and energy.
d. the principle of relativity.
e. none of the above.
a
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Emission lines from different ionization states of the same element appear in the same place in the spectrum
Indicate whether the statement is true or false
Which would have the lower average molecular kinetic energy?
(i) a sample of hydrogen gas, H2, at 0°C (ii) a sample of oxygen gas, O2, at 100° C
1.(i) 2.(ii) 3.They have the same average molecular kinetic energy. 4.It is impossible to tell.A sound intensity of 70 dB is observed at a distance d from the source of sound. What sound intensity would be observed at a distance 2d from the source?
a. 68 dB b. 67 dB c. 64 dB d. 62 dB
A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens. You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens
(a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it? (b) What is the height of the flower's image on the CCD sensor?