Physics, 11.07.2019 19:10 neisha2507
To understand the decibel scale. the decibel scale is a logarithmic scale for measuring the sound intensity level. because the decibel scale is logarithmic, it changes by an additive constant when the intensity as measured in w/m2 changes by a multiplicative factor. the number of decibels increases by 10 for a factor of 10 increase in intensity. the general formula for the sound intensity level, in decibels, corresponding to intensity i is β=10log(ii0)db, where i0 is a reference intensity. for sound waves, i0 is taken to be 10−12w/m2. note that log refers to the logarithm to the base 10.
what is the sound intensity level β, in decibels, of a sound wave whose intensity is 10 times the reference intensity (i. e., i=10i0)?
Answers: 1
Physics, 22.06.2019 15:30, 2605098
Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?
Answers: 2
Physics, 22.06.2019 22:20, bryanmcmillianjr
Which symbol in the first law of thermodynamics represents the sum of the chemical and thermal energy stored in atoms and molecules? a. q b. w c. v d. u
Answers: 3
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