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# Physics Unit 8

The position in a pendulum's motion in which there is no actual force in effect is called _________. equilibrium
At maximum _________, the potential energy of a pendulum is also at maximum. amplitude
At equilibrium, the pendulum's potential energy is zero and the velocity is ________. maximum
The distance between two similar points in consecutive pulses in a wave is called the _________. wavelength
The distance between the center line and the point farthest from the center line in a wave is called the _________. amplitude
In a spring, the period of oscillation depends on the mass and the ______________. spring constant
Waves that require a medium are called ___________ waves. mechanical
Transverse waves vibrate __________ to the line of travel. perpendicular
A regular, repeating motion caused by the exchange of energy from potential energy to kinetic energy and back again is called _____________. simple harmonic motion
Sound waves are an example of _________ waves. mechanical
Waves travel through a medium with a definite _________. velocity
If wavelength increases, frequency _________. decreases
Two waves traveling along the same line will _______ with each other. interfere
In constructive interference, the effect on amplitude is called _________. reinforcement
Sound waves radiate in _______ waves. spherical
Sound waves below 20 Hz are called ___________. infrasonic
Which of the following is NOT an example of an electromagnetic wave? A. x-rays B. visible light C. sound D. radio C. sound
The magnitude of an electromagnetic wave and the _________ vary in an inverse-square relationship. distance
Electromagnetic waves which excite the water molecules in food and cause it to be cooked are _________. microwaves
Electromagnetic waves which cause the body to produce vitamin D are ___________. ultraviolet light
Electromagnetic waves that can both cause cancer and be used in its treatment are _____________. gamma rays
Sound waves above 20,000 Hz are called __________. ultrasonic
The natural vibration of an object to a range of frequencies of sound is called beats. T/F F
Loudness is measured in decibels. T/F T
The Doppler effect results in a change in perceived frequency. T/F T
A changing magnetic field induces an electric charge is the foundational idea of what law? Maxwell's
A fluctuating electric charge creates a magnetic field is the foundational idea of what law? Faraday's
What is the formula relating frequency, wavelength, and speed of an electromagnetic wave? C=f^ ; speed=frequency times wavelength
The electrical and magnetic waves travel ________ to each other and to the direction of travel. perpendicular
As the frequency of waves increases, the wavelength ___________. decreases
Electromagnetic waves with the lowest frequencies are _____________. radio waves
Light waves are a form of ____________ waves. electromagnetic
All electromagnetic waves can be measured in terms of _____________. energy
Light can also be measured in terms of _____________. brightness
The magnitude of light is subject to the inverse-square law between its power at the source and the ____________. distance from the source
A line that is perpendicular to a surface is called a(n) ___________ line. normal
The angle of __________ is equal to the angle of reflection. incidence
The reflected image in a flat mirror is always _____________. reversed
The reflected image in a flat mirror is called a ______________ image. virtual
The image in a concave mirror that is inverted and smaller than the object is called a ____________ image. real
The distance from the surface of a concave mirror where a focused image is formed is called the ________________. focal length
The index of refraction of a material is found by dividing the speed of light in a vacuum by ____________________. the speed of light in a medium
If a light wave enters a medium having a higher index of refraction than the medium it is leaving, it will bend ___________ the normal line. toward
When we see an object, we see light that is _____________ by it. reflected
Different wavelengths of light are refracted at different __________. angles
Sunlight is ____________ light, made up of many colors. composite
Leaves appear green because the leaves _____________ green light. reflect
The sky appears blue because the atmosphere ___________ blue light wavelengths more than it does other wavelengths. scatters
Sound waves radiate in spherical __________ waves. longitudinal
If a light wave enters a medium having a lower index of refraction than the medium it is leaving, it will bend ____________ the normal line. away from
Loudness is measured in ___________. decibels
The Doppler effect results in a change in perceived ___________ of a wave. frequency
The natural vibration of an object to a range of frequencies is called _______________. resonance
The distance from the surface of a concave mirror where a focused real image is formed is called the ____________. focal length
As the frequency of an electromagnetic wave increases, the _____________ decreases. wavelength
In constructive interference, the effect on amplitude is called ________________. reinforcement
Created by: jhincks

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