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 incident normal on the film, what is the minimum thickness of the film?
A) 47.0 nm
B) 74.0 nm
C) 94.0 nm
D) 152 nm
E) 268 nm
C
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Wall posters are usually sold curled up in cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the inside diameter of the tube is 2.40 cm,
what is the area of the poster expressed to the correct number of significant figures? (Assume the poster is just as long as the tube and does not overlap itself.) A) 202.8 cm2 B) 637.1 cm2 C) 203 cm2 D) 319 cm2 E) 637 cm2
How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (?0 = 4? × 10-7 T ? m/A)
A) 120 B) 3200 C) 15 D) 12 E) 1200
Blowing gently across the top of a soda pop bottle gives you a musical note at a certain fundamental frequency. This is most similar to
A. making a guitar string resonate at its fundamental. B. a wind chime. C. an organ pipe. D. a telephone.
One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it
Indicate whether the statement is true or false