MCAT 4D · Chem/Phys
Waves, Sound, Light and Optics
452 original Anki flashcards, a 10-page illustrated study guide, a 3-page cheat sheet and 45 practice questions for MCAT content category 4D.
What is inside
- deck.apkg452 original Anki flashcards (199 short answer, 94 multiple choice, 70 cloze, 69 true/false, 20 image occlusion), 29 original diagrams
- guide.pdf10-page illustrated study guide that explains the ideas
- cheatsheet.pdf3 printable pages, US Letter at 100 percent
- questions.pdf45 original MCAT-style practice questions with explanations, including 3 passage-based sets
- README.txtimport steps
- 199 short answer
- 94 multiple choice
- 70 cloze
- 69 true/false
- 20 image occlusion
Topics (23)
- 01WaWave properties: frequency, wavelength, speed
- 02TrTransverse and longitudinal waves
- 03SuSuperposition and interference
- 04StStanding waves, strings and pipes
- 05ReResonance and harmonics
- 06SoSound production and speed
- 07InIntensity and decibels
- 08DoDoppler effect
- 09UlUltrasound and medical imaging
- 10ElElectromagnetic spectrum
- 11ReReflection and plane mirrors
- 12ReRefraction and Snell's law
- 13ToTotal internal reflection and fiber optics
- 14DiDispersion
- 15SpSpherical mirrors
- 16ThThin lenses and the lens equation
- 17MaMagnification and power of lenses
- 18MuMultiple lens systems and the eye
- 19ViVision correction
- 20DiDiffraction and single slit
- 21DoDouble-slit interference
- 22PoPolarization
- 23PhPhoton energy and the photoelectric effect
Import in 30 seconds
- Install Anki (free) from apps.ankiweb.net.
- Unzip the download, then double-click
deck.apkgor use File, Import. - Cards are tagged under
StudyStore::MCAT. Re-importing a later version updates the same notes. - Print the PDFs on US Letter at 100 percent, or read them on screen.
Previews
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Try it · sample practice questions
Five questions from the pack.
Q1A wave on a string has f = 20 Hz and λ = 0.50 m. The tension is quadrupled while the source still vibrates at 20 Hz. The new wavelength is:
B. Speed is √(T/μ), so quadrupling T doubles v from 10 to 20 m/s. Frequency is fixed by the source at 20 Hz, so λ = v/f = 1.0 m. 0.25 m would result from a halved speed. 0.50 m ignores the speed change, and 2.0 m would need v to quadruple.
Q2A sonar pulse in seawater (v = 1500 m/s) returns from the bottom 0.20 s after it is sent. The depth is:
B. The pulse goes down and back, so d = vt/2 = 1500 × 0.20/2 = 150 m. 300 m forgets the factor of two. 75 m halves it twice, and 7500 m divides speed by time instead of multiplying.
Q3An ultrasound echo returns 130 μs after the pulse is sent. In tissue (v = 1540 m/s) the reflector is at a depth of:
C. d = vt/2 = 1540 × 130 × 10<sup>-6</sup>/2 = 0.10 m. 20 cm omits the half. 5.0 cm is the 65 μs result, and 1.0 cm would be an order of magnitude off.
Q4White light enters a glass prism. Compared with red light, violet light in the glass has:
A. n is larger for violet, so v = c/n is lower, and the greater index also bends it more. A higher speed would go with the red light. A lower speed cannot come with a smaller deviation, and the speeds differ, which is why dispersion occurs.
Q5A swimmer opening their eyes underwater sees a blurry image mainly because:
D. The cornea (n about 1.38) normally refracts light strongly at the air interface. Against water (n = 1.33) there is almost no index change, so most of the power is lost and the image falls far behind the retina. The lens still works. Water does not absorb enough light over a short path to cause blur, and the retina is unaffected.
Those are real questions from the pack, word for word.