A long-term exposure to the sound of a riveting machine can cause your threshold of hearing to shift from 0 dB to 30 dB. What is the sound intensity of a 30-dB sound? The normal lowest detectable intensity is 1.0 × 10-12 W/m2
What will be an ideal response?
1.0 × 10-9 W/m2
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For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________
Fill in the blank(s) with correct word
Meteor showers are generally named
A. after the Greek gods and goddesses. B. after the comet to which they belong. C. after the constellation from which they appear to diverge. D. after the planet from which they seem to come to Earth.
The majority of earthquakes occur where
A) lithospheric plates meet. B) the asthenosphere touches the lithosphere. C) the land surface is made of unconsolidated sediments. D) narrow zones of land touch.
Which is the MOST important property of the element carbon that makes it ideal as a fundamental building block of biological molecules?
A) it is a very stable element B) it is the only element capable of bonding to itself C) it is a common element D) it readily forms chemical bonds with itself and other elements, allowing a wide variety of complex molecules to form