10) A 500 nm wavelength light illuminates a soap film with an index of refractio

Question

10) A 500 nm wavelength light illuminates a soap film with an index of refraction 1.33 to make it look bright. If the beam of light is light is incident normal on the film, the minimum thickness of the film? A) 47.0 nm B) 14.0 nm C) 94.0 nm D) 152 nm 11) The impedance in an RLC circuit is minimum when: A) The capacitive reactance and the inductive reactance are not the same B) The capacitive reactance is zero C) The capacitive reactance and the inductive reactance are the same D) The inductive reactance is zero 12) Electromagnetic waves can be produced by: A) Electric charges moving with constant velocity. B) Electric charges at rest. C) Electric charges in accelerated motion. D) All of the previous answers are correct.

Explanation / Answer

when capacitive reactance is equal to indutive reactance i.e the condition of resonance

Z = sqrt (R^2 +(XL - XC)^2)

at resonance XL = XC so Z =R

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