The rate at which a transformer transfers energy is called
A) electromagnetic induction.
B) transformer efficiency.
C) power.
Answer: C
Physics & Space Science
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Which of the following is a form of natural radioactivity that will be deflected by a magnetic field?
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A marshmallow in a vacuum becomes
A) larger. B) smaller. C) does not change.
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A silver wire has a cross sectional area A = 2mm2. A total of of 9.4 × 1018 electrons pass through the wire in a time t = 3s. Silver has nq = 5.8 × 1028 electrons/m3. What is the drift velocity of these electrons?
A) 2.7 × 10-5 m/s B) 9.1 × 10-5 m/s C) 5.2 × 10-5 m/s D) 1.1 × 10-5 m/s E) 7.4 × 10-5 m/s
Physics & Space Science
What is the intensity level of a sound with intensity of 5.0 × 10^-11 W/m2? (I0 = 10-12 W/m2)
a. 74 dB c. 17 dB b. 54 dB d. 27 dB
Physics & Space Science