A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 × 10-12 W/m2
A) 61 dB
B) 63 dB
C) 65 dB
D) 68 dB
C
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To "spear" a blue fish with a red laser beam and compensate for refraction, aim your laser
A) directly at the sighted fish. B) above the sighted fish. C) below the sighted fish.
An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are 1.333 and 1.466 . If a ray of light is incident on the air-to-oil surface at an angle of 41.9° with the normal, what is the incident angle at the oil-to-water surface?
a. 30.1° b. 27.1° c. 37.4° d. 41.9° e. 33.5°
On a particular day, the air temperature is 75°F. If lowering the air temperature by 9° would cause the air to be saturated, what is the relative humidity?
A 0.5 kg fish, hooked as shown below, starts to swim away at a speed of 3 m/s. The angular momentum of the fish relative to the hand holding the fishing rod is about
a.
