In ultrasound the __________ of the sound is much greater than in normal sound
Fill in the blank(s) with correct word
frequency
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Coulomb's Law: Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2. What is the magnitude of the charge on each bead? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 510 nC B. 44 nC C. 1800 nC D. 890 nC E. 1300 nC
Spicules
a. are found in the photosphere. b. are magnetic disturbances that push large loops of material off the solar surface. c. are responsible for twisting the solar magnetic field and causing the sunspot cycle. d. appear in the corona near the north and south poles of the Sun during a total solar eclipse. e. are visible in filtergrams of the solar chromosphere.
What elements do the symbols H, O, C, and N stand for?
a. hydrogen, ozone, carbon, nitrogen b. hydrogen, oxygen, chlorine, nitrogen c. hydrogen, oxygen, carbon, natrium d. hydrogen, oxygen, carbon, nitrogen e. none of the above
A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second. b. decrease the tension on the hose and shake the end more times per second. c. increase the tension on the hose and shake the end fewer times per second. d. decrease the tension on the hose and shake the end fewer times per second. e. keep the tension and frequency the same but increase the length of the hose.