When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave)?
a. perpendicular
b. parallel
c. anti-parallel (in opposite direction)
d. Both choices b and c are valid.
d
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The Doppler effect is sensitive only to motion along the line of sight
Indicate whether the statement is true or false
The ________ cycle of the phases of the Moon is due to the Moon's spherical shape and the ______ shining on it from different directions
a. monthly; Earth b. yearly; Earth c. monthly; Sun d. yearly; Sun
If one lawn mower causes an 80-dB sound level at a nearby point, what sound level at that point would four lawnmowers together cause?
The focal lengths of the objective and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain (with the final image at the viewer's far point) is 6.0 cm
The near point of the person using the microscope is 25 cm and the far point is infinity. (a) If the microscope is focused on a small object, what is the distance between the object and the objective lens? (b) If the microscope is focused on a small object, what is its final magnification?