A sound with a frequency of 25 kHz is in the ______________ region of the sound spectrum
a. infrasonic
b. ultrasonic
c. audible
d. visible
b
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An iron atom’s nucleus has 26 protons and 30 neutrons. A helium atom’s nucleus has 2 protons and 2 neutrons. Solid iron is much denser than helium gas. How does the total positive charge in a gram of iron compare to that of a gram of helium?
A. Iron has more positive charge than helium per gram. B. Iron has the same positive charge as helium per gram. C. Iron has less positive charge than helium per gram. D. There is not enough information to tell.
An ac generator consists of a coil with 40 turns of wire, each with an area of 0.06 m2. The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55Hz. What is the maximum induced emf?
A) 110 V B) 625 V C) 200 V D) 421 V E) 332 V
Which of the following molecules could be a structural isomer for the underlined molecule below?
A) a B) b C) c D) all of the above E) none of the above
Earth's internal layers were discovered by studying
A) seismic waves. B) the Mohorovicic discontinuity. C) Rayleigh and Love waves. D) convection cells.