A ray in glass arrives at the glass-water interface at an angle of 48° with the normal. The refracted ray, in water, makes a 72° angle with the normal. The index of refraction of water is 1.33. Then the ray in glass is redirected so its new angle of incidence is 37°. What is the new angle of refraction in the water? Show all work. (2 points)
An electromagnetic wave of frequency 2.30 × 10^14 Hz propagates in carbon tetrachloride with a speed of 2.05 x 10^8 m/s. What is the wavelength of the wave in carbon tetrachloride? Show all work and include units of measure. (2 points)
Based on the data in the graph provided, which value is closest to the index of refraction of quartz for extreme violet light of wavelength 400 nm? (1 point)
1.44
1.53
1.56
1.67
The index of refraction of medium 1 is 2.3 and the index of refraction for medium 2 is 1.6. What is the critical angle for light traveling within medium 1 toward medium 2? (1 point)
40°
14°
44°
70°
A ray of laser light strikes a glass surface at an angle θa = 22.5° to the normal. What is the angle θb of the refracted ray? Let the index of refraction for glass nb = 1.77. (1 point)
12.7°
12.5°
31.8°
10.1°
As explained by the theory of quantum electrodynamics, light is best described as _____. (1 point)
Both a wave and particles.
A wave, not particles.
Particles, not a wave.
Match the following types of electromagnetic waves with where they exist on the electromagnetic spectrum. (2 points)
1
2
3
4
a. Radio Waves
b. Infrared
c. Gamma Rays
d. X-Rays
Describe the difference(s) between electromagnetic waves and mechanical waves. Provide an example of each in your descriptions. (2 points)
A step-down transformer providing electricity for a residential neighborhood has exactly 2750 turns in its primary. When the potential difference across the primary is 5670 V, the potential difference at the secondary is 240 V. How many turns are in the secondary? Show all work. (2 points)
A circuit has 3 resistors, all connected in parallel. Let R1 = 4.0 Ω, R2 = 3.0 Ω, and R3 = 6.0 Ω. What is the equivalent resistance of the circuit? Show all work and include units of measure.
