The Richter Scale<span> is not commonly </span>used<span> anymore, except for small </span>earthquakes<span>recorded locally, for which ML and Mblg are the only </span>magnitudes<span> that can be measured. For all other </span>earthquakes<span>, the </span>moment magnitude scale<span> is a more accurate measure of the </span>earthquake<span> size.</span>
Answer:
The evaporation of water is an example of a change in Pysical Change .
less than 20 Hz
The frequency of subsonic sound is less than 20 Hz
subsonic sound refers to a sound which has a wave that travels slower than the speed of sound.
- frequency of audible sound: 20 Hz to 20,000 Hz
<u>Thus </u>subsonic sound < 20 Hz
Question #1:
That's an description of an <em>parallel</em> circuit. <em>(b)</em>
Question #2:
Power = (current) x (voltage)
Power = (0.4 A) x (120 v)
Power = <em>48 watts</em>