Two sounds of the same intensity are added together. The intensity of the resulting sound is how many decibels greater than the intensity of one of the original sounds? The resulting sound
1.will have twice the decibel level as one of the original sounds.
2.will have the same decibel level as one of the original sounds.
3.will be two decibels higher than the original sound.
4.will be three decibels higher than the original sound.
4
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Active galaxies were first discovered by observations in the _______________ wavelength band
Fill in the blank(s) with correct word
Within a given system, the internal forces
A. are always balanced by the external forces. B. all add to zero. C. are only determined by subtracting the external forces from the net force on the system. D. determine the motion of the system. E. are measured with a gravimeter.
A large and a small person wish to parachute at equal terminal velocities. The larger person should
A) get a larger parachute. B) jump lightly. C) pull upward on the supporting strands to decrease the downward net force. D) jump first from the plane.
Ice tends to form first at the
A) surface of bodies of water. B) bottom of bodies of water. C) either depending on water depth.