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Physics practice test 3, Cheat Sheet of Physics

This is a Physics 121 practice test 3.

Typology: Cheat Sheet

2023/2024

Uploaded on 10/05/2024

veronica-twardowski
veronica-twardowski 🇺🇸

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Practice Test Three, Physics 122
1) The intensity of light is 5mW/m2. What is the maximum electric field? _______
I=Emax
2
2μ0c
2) Light coming from material “A” with an index of refraction of 2.5 goes into a second
material, “B” (n =1.5) at an angle of 25º.
What angle is the light reflected within the material A? __________
What angle is the light transmitted into the material B? ____________
For light in material “A” going to material “B”, what is the critical angle? __________
3) While looking through a lens, objects that are close appear larger, but farther away.
What type of lens is this? ___________
4) Calculate the location, type and magnification of the image and draw a ray diagram
showing how the image is formed for the following situations:
a) A divergent lens with a focal length of -20 cm has an object 30 cm away from the
lens.
b) A convergent lens with a focal length of 20 cm has an object 15 cm away from the
lens.
5) In air material “C” has a critical angle of 65º.
What is the index of refraction for this material “C”? _____________________
What is the speed of light in the material “C”? ________________
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Practice Test Three, Physics 122

  1. The intensity of light is 5mW/m^2. What is the maximum electric field? _______ I = Emax 2 2 μ 0 c
  2. Light coming from material “A” with an index of refraction of 2.5 goes into a second material, “B” (n =1.5) at an angle of 25º. What angle is the light reflected within the material A? __________ What angle is the light transmitted into the material B? ____________ For light in material “A” going to material “B”, what is the critical angle? __________
  3. While looking through a lens, objects that are close appear larger, but farther away. What type of lens is this? ___________
  4. Calculate the location, type and magnification of the image and draw a ray diagram showing how the image is formed for the following situations: a) A divergent lens with a focal length of -20 cm has an object 30 cm away from the lens. b) A convergent lens with a focal length of 20 cm has an object 15 cm away from the lens.
  5. In air material “C” has a critical angle of 65º. What is the index of refraction for this material “C”? _____________________ What is the speed of light in the material “C”? ________________
  1. In a vacuum, light is 400 nm, what is the wavelength and frequency in water with n = 1.33? ________________
  2. The energy level of a hydrogen atom is found by using En = −13.6 eV n 2 Find the energy difference between the third (n=3) and fourth (n=4) levels in eV.
  3. A 105 pF capacitor, 1.2 mH inductor and 300 ohm resistor are in a circuit. What is the resonant frequency of the circuit? ________
  4. For an anti-reflective coating a material with an index of refraction n = 1.35 must be a quarter of a wavelength of light in the material thick. We wish to stop the reflection of light of a wavelength  = 550 nm in a vacuum. What is the wavelength of light in the material? _____________ How thick should the coating be? _________________
  5. Light of 501.3 nm is detected from a star moving toward us at 4.00x10^5 m/s. What was the original wavelength of light from the star? _______