Recommendation for individuals using a screenreader: please set your punctuation settings to "most."
Descriptive Statements:
- Demonstrate knowledge of the characteristics and types of waves.
- Demonstrate knowledge of wave propagation and how waves transfer energy and momentum.
- Describe factors that affect the speed of a wave in different media.
- Solve problems involving wave speed, frequency, and wavelength.
- Analyze the reflection, refraction, and polarization of waves.
- Apply the superposition principle to analyze wave phenomena.
- Demonstrate knowledge of the Doppler effect.
- Demonstrate knowledge of the relationships between a sound wave and the human perception of sound.
- Solve problems involving standing waves, resonance, and sounds produced by waves on a string or in a pipe, given various boundary conditions.
- Solve problems involving the intensity of sound and the decibel scale.
Sample Item:
A person standing 85 m from a wall shouts and hears the echo 0.50 s later. The person
then plays a note of 440 Hz on a flute. What is the wavelength of the note in air?
- 0.39 m
- 0.77 m
- 1.3 m
- 2.6 m
Correct Response and Explanation (Show Correct ResponseHide Correct Response)
B. This question requires the examinee to solve a problem involving wave
speed, frequency, and wavelength. Since the person hears the echo of the shout after
0.50 s, the speed of sound is 170 m/0.50 s or 340 m/s. Since v = fλ, the
wavelength is λ = 0.77 m170 m slash 0.50 s or 340 m slash s. Since v equals f lambda, the
wavelength is lambda equals 0.77 m.
Descriptive Statements:
- Demonstrate knowledge of the electromagnetic spectrum and the production and transmission of electromagnetic waves.
- Apply the ray model of light and the thin lens equation to analyze characteristics of lenses and mirrors.
- Solve problems using Snell's law in various situations.
- Apply the wave model of light to describe phenomena such as interference, dispersion, diffraction, and polarization.
- Apply properties of light to describe the operation of optical devices such as filters, magnifying devices, and diffraction gratings.
- Describe various phenomena (e.g., electron transitions, atomic spectra, operation of a laser) using the photon model of light.
Sample Item:
A light-emitting diode (LED) on a consumer device emits 0.020 W of light of wavelength
λ = 650 × 10−9 m.lambda equals 650 times 10 superscript negative 9 m. Which of the following expressions equals the number
of photons emitted by the LED per second in terms of Planck's constant (h) and the speed
of light (c)?
- 0.020λ/hc0.020 lambda over hc
- 0.020hc/λ0.020hcover lambda
- 0.020hλ/c0.020h lambda over c
- 0.020/hcλ0.020 over hc lambda
Correct Response and Explanation (Show Correct ResponseHide Correct Response)
A. This question requires the examinee to describe various phenomena
using the photon model of light. The energy of a single photon is given by
E = hfE equals hf. For light, c = fλ, so E = hc/λc equals f lambda, so E equals hc over lambda;.
Since the power of the LED is 0.020 W, dividing the power by the energy of a single
photon gives the number of photons emitted per second.
View Cart