Intensity of Sound: 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
Answer: C
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A) troposphere, stratosphere, thermosphere, exosphere B) thermosphere, stratosphere, troposphere, exosphere C) exosphere, stratosphere, thermosphere, troposphere D) troposphere, thermosphere, stratosphere, exosphere
During the annihilation of matter and antimatter, what percentage of the mass of the colliding particles is converted into energy?
A) 0.7% B) 0.07% C) 70% D) 100%
If gold were used as nuclear fuel, it would be best
A) fused. B) fissioned. C) either of these
Suppose the Sun had been born with less mass, making it a smaller, cooler star. Which of the following consequences would we expect according to the nebular theory?
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