Intensity of Sound: If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A. 67 dB
B. 13 dB
C. 44 dB
D. 88 dB
Answer: D
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One difference between a microscope and a telescope is that the image formed by the objective is
A. real for the microscope but virtual for the telescope. B. virtual for the microscope but real for the telescope. C. real for both, but the image is enlarged for the microscope and reduced for the telescope. D. real for both, but the image is reduced for the microscope and enlarged for the telescope.
The efficiency of classroom-demonstration lasers is typically
A) about one percent. B) about ten percent. C) about twenty percent. D) more than twenty percent.
In the circuit shown in Figure OQ28.12, each battery is delivering energy to the circuit by electrical transmission. All the resistors have equal resistance. Rank the electric potentials at points a, b, c, d, and e from highest to lowest, noting any cases of equality in the ranking
The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
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