What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) in air if the film is 70.0 nm thick?
a. 558 nm
c. 450 nm
b. 430 nm
d. 409 nm
D
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For experiments involving the setup shown in figure Q4.1a, which of the following possible results (if seen) about the value displayed by the ammeter would probably not be consistent with the wave model of light? 
A. It is zero for some time after light starts shining. B. It increases as the light’s intensity increases. C. It varies as the light’s wavelength changes. D. It is zero if the wavelength is larger
A square coil, enclosing an area with sides 2.75 cm long, is wrapped with 1 875 turns of wire. A uniform magnetic field perpendicular to its plane is turned on and increases to 0.390 T during an interval of 1.70 s. What average voltage is induced in the coil?
a. 0.325 V b. 0.553 V c. 1.73 V d. 0.118 V e. 1.82 V
In the SI, weight is expressed in units of ______________
Fill in the blank(s) with correct word
As the distance between two objects increases, how does the force of gravity between them decrease