Intensity level of threshold of pain is: _____________?
Correct answer: D. 120 db
- A. 60 db
- B. 80 db
- C. 100 db
- D. 120 db
Explanation
The threshold of pain is conventionally taken to be about 120 dB, corresponding to a very large sound intensity compared with the reference intensity. The likely mistake is 100 dB, which is a dangerously loud level but is below the conventional threshold of pain.
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The speed of sound depends on the properties of the medium, including its elasticity and density, and in gases it varies mainly with temperature. Questions connect speed with frequency and wavelength, compare sound in solids, liquids and gases, and distinguish the speed of propagation from the oscillating particles' motion.
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