Consider a sound intensity of 16. × 10-8 W/m2
(a) What is the sound intensity level?
(b) At twice the distance from the source, what would be the intensity level?
(c) At how many times the original distance would the intensity level decrease by 12. db?
(a) 52. db
(b) 46. db
(c) 4.0 times
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In the Copernican model, Venus moves around an epicycle centered on a line between Earth and the Sun
Indicate whether the statement is true or false
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 0.82 mT b. 0.93 mT c. 0.70 mT d. 0.58 mT e. 0.40 mT
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave with the largest wavelength is wave
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above
The most striking example of solar variability was the
A) Dust Bowl drought of the 1930s. B) Maunder Minimum from 1645-1715. C) Sporer Minimum that doomed the Anasazi. D) fall of Rome. E) Joseph's seven lean years in the Old Testament.