If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?
A) 7.6 × 105 A/m2
B) 5.2 × 10-6 A/m2
C) 1.9 × 105 A/m2
D) 3.6 × 105 A/m2
E) 21 × 10-6 A/m2
A
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What wavelength of light entering the gas caused this excitation? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 110 nm B) 91.4 nm C) 95.2 nm D) 2280 nm
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Indicate whether the statement is true or false
At a distance of 2.00 m from a point source of sound, the intensity level is 80.0 dB. What will be the intensity level at a distance of 4.00 m from this source? The lowest detectable intensity is 1.0 × 10-12 W/m2
A) 77.0 dB B) 74.0 dB C) 60.0 dB D) 40.0 dB E) 20.0 dB
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A. 1 B. 2 C. 3 D. 4 E. 5