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Question: 5 a jackhammer operator wears a set of protective headphones...

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5. A jackhammer operator wears a set of protective headphones. Through the headphones, a sound wave is broadcast that is 180 out of phase with the jackhammer sound wave. The result is that he does not hear the sound of the jackhammer. The two sound waves are an example of which of the following? (> (A) Standing wave (B) Transverse wave (C) Destructive interferende (D) Constructive interference 6. Four electrons they are moving at the same velocity with respect to a magnetic field, but are moving at different angles relative to the direction of the magnetic field. Upon which electron does the magnetic field exert the least force? (A)0° (B) 30° (C) 60° (D) 90° ite the 7. An electron in an electric field experiences a force of 1 x 109 N oppos direction of the field. What is the magnitude of the electric (A) 1.6 x 10-25 N/C (B) 1.6 x 10-24 N/C (C)6.3 x10 field? ( N/C (D) 6.3x 102 NC 8, A 1 μF capacitor has plates that are 0.2 mm apart. There i between the plates. What is the area of the plates (A) 0.23 m2 (B) 2.3 m2 (C) 23 m2 (D) 230 m2
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