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A stereo amplifier is rated at 175 $\mathrm{W}$ output at 1000 $\mathrm{Hz}$ . The power output drops by 12 $\mathrm{dB}$ at 15 $\mathrm{kHz}$ . What is the power output in watts at 15 $\mathrm{kHz}$ ?
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Physics 101 Mechanics
Chapter 16
Sound
Periodic Motion
Mechanical Waves
Sound and Hearing
University of Washington
Hope College
University of Sheffield
Lectures
08:15
In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Humans can only hear sound waves as distinct pitches when the frequency lies between about 20 Hz and 20 kHz. Sound above 20 kHz is known as ultrasound and has different physical properties from sound below 20 kHz. Sound waves below 20 Hz are called infrasound. Different species have different hearing ranges. In terms of frequency, the range of ultrasound, infrasound and other upper limits is called the ultrasound.
04:49
In physics, a traveling wave is a wave that propogates without a constant shape, but rather one that changes shape as it moves. In other words, its shape changes as a function of time.
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really do to 1000 hearts outward. 15 kilohertz, 15 kilohertz. Um, output is output is output. He's Oh, put is minus minus 12 decibels, minus 12 decibels. So DBS, then the power corresponding to, um, 15 kilohertz. We can write it to minus 12 decibels. That is equal to 10 times. Log off there. Log off the power cross sporting too. Or 15 killer hearts. 15 kilohertz. It hurts O r or 1 75 What's then by making while we're subject 15 kilohertz, Kilohertz. 15 do hurts. Um, we get 10 to the power. 10 to the power minus 1.2 minus 1.2 times times 1 75 1 75 And this gives us the value off 11 words. So end off the problem. Thank you for watching.
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