What factors affect the strength-duration curve?
Click to see answer
Pulse shape, Rheobase, Chronaxy, Muscle fiber length (indirectly)
Click to see question
What factors affect the strength-duration curve?
Pulse shape, Rheobase, Chronaxy, Muscle fiber length (indirectly)
What best describes the law of conservation of charge?
Charge cannot be created or destroyed in an isolated system.
What is true about capacitance, plate area, and distance?
Capacitance increases with larger plate area and decreases with increased distance between plates.
What is the SI unit of electric charge?
Coulomb (C)
What does the Hennemann principle describe?
Motor units are recruited from smallest to largest (slow-twitch before fast-twitch).
Where is the density of Na+ channels highest in a myelinated axon?
At the nodes of Ranvier
What is true about electric field superposition?
Electric fields add vectorially (principle of superposition).
What does B-mode in ultrasound stand for?
Brightness Mode
Carcinogenesis is a...?
Stochastic effect
What is the main target of radiation in cells?
DNA
What are the stages of acute radiation sickness?
Prodromal. Latent. Manifest illness
How does gamma decay affect atomic number (Z)?
Z remains the same
Which atomic model resulted from the Geiger-Marsden experiment?
Rutherford model
What is the result of mixing green and red in color theory?
Yellow
What do primary colors mix to form in color theory?
Secondary colors
How does sound intensity change if the distance doubles?
Intensity decreases by a factor of 4
What sound level is approximately 50 decibels?
A normal conversation
What is the frequency of light with a wavelength of 600 nm?
5 × 10^14 Hz
What conditions create a virtual image with a convex lens?
Object placed closer than 1f to the lens
What conditions create a virtual image with a concave lens?
Object placed anywhere in front of the lens
What is true about surface waves?
They can be diffracted and transport energy, not matter
Which eigenmode results in the wavelength equaling the string length?
Fundamental mode (first harmonic)
What is true about convex lenses?
They converge parallel rays at the focal point and cause converging ray bundles.
Which factors affect angular eigenfrequency of a harmonic oscillator?
Mass and spring stiffness (spring constant).
What is true about total internal reflection (TIR)?
It occurs at the boundary between two media and is used in fiber optics.
What are properties of an oscillator?
It is harmonic, repetitive, and a deviation from a baseline value.
What is the length of a vertical open pipe producing a sound at 340 Hz?
0.25 m
How is myopia corrected?
Using concave (diverging) lenses
What causes thin film interference?
Reflections at top and bottom surfaces
What is a characteristic of laser light?
Laser light has constant phase (coherent)
What factors affect the speed of sound?
Depends on elasticity and density
What is the formula for a diopter?
D = 1 / focal length (in meters)
What happens to light intensity when it passes through two polarizers oriented at 90° to each other?
Intensity becomes zero.
What is the effect of the first polarizer on unpolarized light?
One polarizer reduces intensity to 50%.
What is the tension in a string under a 500 kg mass with g = 10 m/s²?
Tension = 5000 N.
What is needed to calculate the time for a wave roundtrip in a string?
Linear mass density µ to calculate v=T/µ, then t=2L/v.
