Electromagnetic Waves, Sound & Wave Properties
Electromagnetic Waves, Sound & Wave Properties
Electromagnetic waves used in communication with wavelengths between about 1 cm and 20 cm are called (microwaves).
Electric signals that have only two possible values (on and off) are (digital signals).
A(n) (photon) is an electromagnetic wave that behaves like a particle.
Electromagnetic radiation with wavelengths between 400 and 750 billionths of a meter that can be detected by the human eye is (visible light).
A system of satellites, ground monitoring stations, and receivers that can determine a person’s location is called (GPS).
Ultra-high frequency electromagnetic waves between ultraviolet and gamma rays in frequency are called (X-rays).
(Radio waves) are the type of electromagnetic waves that are used in radar and MRI.
A remote control uses (infrared light) to communicate with a television set.
If you stay outdoors too long, your skin might be burned by exposure to (ultraviolet radiation) from the Sun.
A radio station broadcasts a radio wave called a (carrier wave) at a specific frequency assigned to the station.
A(n) (transceiver) is a device that transmits at one frequency and receives at another.
Transverse waves that are produced by vibrating electric charges and consist of vibrating electric and magnetic fields are called (electromagnetic).
Electric signals whose values change smoothly over time are called (analog).
What is the process of applying a signal to a carrier wave in order to transfer information? (Modulation).
In (longitudinal) waves, matter in the medium moves back and forth in the same direction as the wave travels.
Waves that can only travel through matter, such as sound waves, are called (mechanical waves).
A (medium) is a material through which a wave transfers energy.
In (transverse) waves, matter in the medium moves back and forth at right angles to the direction the wave travels.
A (wave) is a repeating disturbance that transfers energy through matter or a vacuum.
(Amplitude) is a measure of the disturbance that a wave causes.
The more-dense region of a longitudinal wave is called a (compression).
The high point on a wave is called its (crest).
The (frequency) of a wave is how many wavelengths pass a fixed point each second.
The (period) of a wave is the amount of time it takes one wavelength to pass a point.
What is the less-dense region of a longitudinal wave called? (Rarefaction).
A (wavelength) is the distance between one point on a wave and the nearest point just like it.
(Diffraction) occurs when waves bend around a barrier.
The process in which two waves overlap and form a new wave is called (interference).
A (wave) is a repeating disturbance that transfers energy through matter or space.
(Refraction) is the bending of a wave caused by a change in its speed as it moves from one medium to another.
Adding energy at the natural frequency of an object is called (resonance).
(A standing wave) is a wave pattern that forms when waves of equal wavelengths and amplitude, but traveling in opposite directions, continuously interfere with each other.
What are the lowest points of a transverse wave called? (Troughs).
The (eardrum) is a tough membrane in the outer ear that is about 0.1 mm thick and transmits sound vibrations into the middle ear.
(Intensity) is the amount of energy that flows through a certain area in a specific amount of time.
(Music) is a collection of sounds deliberately used in a regular pattern.
A(n) (resonator) is a hollow, air-filled chamber that amplifies sound when the air inside it vibrates.
(Sound quality) is the result of the differences between sounds having the same pitch and loudness.
Sound waves with a frequency above 20,000 Hz that cannot be heard by humans are known as (ultrasound).
The human perception of sound volume is (loudness).
A(n) (overtone) is a vibration whose frequency is a multiple of the fundamental frequency.
The study of sound is (acoustics).
The process of locating objects by emitting sounds and interpreting the reflected sound waves is (echolocation).
(Sonar) is a system that uses the reflection of underwater sound waves to detect objects.
The change in pitch due to a moving wave source is called the (Doppler effect).
(Pitch) depends primarily on sound frequency and is the perception of how high or low sound is.
The (cochlea) is a spiral-shaped structure in the ear filled with liquid.
A(n) (decibel) is a unit of sound intensity.