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50 Cards in this Set

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What is the law of reflection?
The angle of incidence is equal to the angle of reflection
When a wave is reflected from a surface, energy is transferred. When is the transfer of energy greatest?
When the wave is nearly parallel to the reflecting surface.
A refracted wave occurs when a wave passes from one medium into another medium. What determines the angle of refraction?
The angle between the normal and the path of the wave through the second medium
_________ is the bending of the wave path when the waves meet an obstruction
Diffraction
The amount of diffraction depends on the _______ of the wave.
wavelength
The apparent change in frequency or pitch because of motion is explained by what effect?
Doppler Effect
The normal hearing range extends from about _____ hertz
20 to 20,000
Sound waves are _______ waves
Compression
Three basic elements for transmission and reception of sound must be present before a sound can be produced. They are?
1. The sourse (or transmitter)
2. A medium for carrying the sound
3. The detector (or receiver)
Sound cannot exist in ______?
Empty space (or a vacuum).
The material through which sound waves travel is called the __________.
Medium
The _______ the density of the medium, the slower sound travels through it.
Higher
Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal?
An amplifier
Sound waves vary in ______ according to their frequency.
Length
A complete wavelength is called a ______.
Cycle
The distance from one point on a wave to the corresponding point on the next wave is a ______.
Wavelength
Sounds may be broadly classified into two general groups. They are?
Noise and Tones
Sound has three basic characteristics. What are they?
1. Pitch
2. Intentity
3. Quality
The term PITCH is used to describe the ______ of a sound.
Frequency
When the frequency is ____, sound waves are long; when it is ____, the waves are short.
low; high
The intensity of sound, at a given distance, depends upon the ______ of the waves.
Amplitude
Sound _____ is a measure of the sound energy of a wave.
Intensity
What characteristic of sound enables a person to distinguish one musical instrument from another, if they are all playing the same note?
Quality
What are two basic physical properties that govern the velocity of sound through the medium?
1. Elasticity
2. Density
______ is the ability of a strained body to recover its shape after deformation, as from a vibration or compression.
Elasticity
_______ of a medium or substance is the mass per unit volume of the medium or substance.
Density
The science of sound is called ______.
Acoustics
An _____ is the reflection of the original sound wave as it bounces off a distant surface.
Echo
________ is the multiple reflections of sound waves.
Reverberation
Any disturbance, man-made or natural, that causes an undesirable response or the degradation of a wave is referred to as _______.
Interference
The most complex sound wave that can be produced is _____.
Noise
If the object is a source of light energy, it is called ______.
Luminous
According to the view now generally accepted, light is a form of __________.
Elctromagnectic radiation
What are three means of producing light?
Mechanical, electrical, and chemical.
What is the smallest unit of radiant energy?
A photon.
What unit is used to measure the different wavelengths of light?
Angstrom unit.
The wavelength of light (in air) determines the _____ of the light.
Color
Substances that transmit almost all the light waves that fall upon them are said to be _________.
Transparent
Substances through which some light rays can pass but through which objects cannot be seen clearly because the rays are diffused are called _______.
Translucent
Substances that do not transmit any light rays are called ______.
Opaque
What are the three primary colors of light?
Red, green and blue.
What are the three secondary colors of light?
Magenta, yellow and cyan.
The velocity of light, which is the same as the velocity of other electromagnetic waves, is considered to be constant, at _________.
186,000 miles per second
The change of direction that occurs when a ray of light passes from one transparent substance into another of different density is called ________.
Refraction
The apparent bending of a spoon when it is immersed in a cup of water is an example of what?
Refraction
When light strikes a piece of white paper, the light is reflected in all directions. What do we call this scattering of light?
Diffusion
Sound waves travel through air at the speed of approximately _______.
1,100 feet per second
The term ________ is used to designate the entire range of electromagnetic waves arranged in order of their frequencies.
Spectrum
An _______ is a conductor or a set of conductors used either to radiate electromagnetic energy into space or to collect this energy from space
Antenna
An electromagnetic wave consists of two primary components. They are?
An electric field and a magnetic field.