If the distance between a point sound source and a dB detector is increased by a factor of 10, what will be the reduction in intensity level?
a. 10 dB
c. 20 dB
b. 16 dB
d. 32 dB
C
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A conducting rod is sliding on metal rails with velocity v. A magnetic field B is into the paper, the separation of the rails is L, and the resistance of the circuit is R. In what direction in the diagram is the current flowing in the resistor?
A. up
B. down
C. up then down
D. down then up
E. Insufficient information given,
Which of the following pure annealed materials would you expect to have the highest yield stress?
(a) FCC copper (b) BCC iron (c) HCP magnesium (d) LDPE
An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon. What is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 1100 m/s B) 980 m/s C) 910 m/s D) 840 m/s E) 770 m/s
Geologic evidence places Earth's age at ______________ million years
Fill in the blank(s) with correct word