Question

I need your help please.

5. A jackhammer operator wears a set of protective headphones headphones, a sound wave is broadcast that is 180° out of phase sound wave. The result is that he does not hear the sound of the ia sound waves are an example of which of the following? ( (A) Standing wave (B) Transverse wave (C) Destructive interference (D) Constructive interference ones. Through the with the jackhammer two ckhammer. The 6. Four electrons are moving at the same velocity with respect to a magnetic field, but they 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 f 1 x 106 N opposite the 7. An electron in an electric field experiences a forceo direction of the field. What is the magnitude of the electric fie (A) 1.6x10-25 N/C (B) 1.6×10-24N/C (C) 6.3×1024 N/C (D) 6.3x 1025 N/C 8, A 1μF capacitor h between the plates. What is the area of the plates? (A) 0.23 m2 (B) 2.3 m2 (C) 23 m2 (D) 230 m2 as plates that are 0.2 mm apart. There is only empty space

Answer 1

5. As the phase difference is $180^0$ they interfere destructively,hence option C ,Destructive interference is correct.

6.Since force is $F = qvB Sin \theta$ force will be minimum when $\theta = 0^{^{0}}$

there fore option A is correct

7. Electric field $E= \frac{F}{q} = \frac{1\times 10^{6}}{1.6\times 10^{-19}}= 6.3\times 10^{24}N/C$

hence option C is correct

8. Area of plates