Show:
Waves and Vibrations
Sound
Light
Color and Refraction
Lenses and Diffraction
100
The highest point on a wave.
What is a crest.
100
Sounds with a frequency below the range of human hearing are referred to as this.
What is infrasonic sound.
100
Light travels at this speed, known as the speed of light.
What is 300,000 km/s, or 186,000 miles/sec.
100
These chemicals selectively absorb and reflect different frequencies of light due to the behavior of their electrons.
What are pigments.
100
Diverging lenses produce these types of images.
What are virtual images.
200
The unit used to measure frequency, equal to an inverse second.
What is Hertz.
200
This is the phenomenon in which an object is made to vibrate by another object vibrating nearby.
What is forced vibration.
200
The lowest frequencies, and highest wavelengths, belong to these waves on the electromagnetic spectrum.
What are radio waves.
200
Pairs of colors which add up to make white light are referred to as this.
What are complementary colors.
200
This is an imaginary line which passes through the centers of curvature on either side of the lens and is used to create ray diagrams.
What is the principal axis.
300
A three word term for the back-and-forth motion of a pendulum, or any other vibrating object.
What is Simple Harmonic Motion.
300
This is the phenomenon in which the crests and troughs of two overlapping waves coincide, causing an increase in intensity.
What is constructive interference.
300
The highest frequencies, and lowest wavelengths, on the electromagnetic spectrum belong to these waves.
What are gamma waves.
300
These two primary subtractive colors, when mixed together, will cause the color red to appear on printed paper.
What are magenta and yellow.
300
In a telescope or microscope, this is the lens positioned closest to the item being viewed.
What is the objective lens.
400
A wave in which the medium vibrates in a direction parallel to the direction of energy motion.
What is a longitudinal wave.
400
Busy street traffic, at 70 dB, is this many times louder than the sound of a whisper, at 20 dB.
What is 100,000 times louder.
400
Glass is transparent to visible light, but it opaque to this type of wave.
What are ultraviolet waves.
400
This is the phenomenon in which light strikes a surface and is reflected in many directions.
What is diffuse reflection.
400
This term describes a light source whose waves are monochromatic and in phase.
What is coherent.
500
The stationary points on a standing wave.
What are nodes.
500
The beat frequency caused by two sounds playing simultaneously near each other, one at 700 Hz and one at 525 Hz.
What is 175 Hz.
500
Light that reflects at glancing angles to shiny, non-metallic surfaces such as the ocean or the surface of a road gain this property.
What is polarization.
500
These lines, drawn perpendicular to the direction of wave motion, help us explain why refraction happens.
What are wave fronts.
500
This phenomenon causes the appearance of color in bird feathers, soap bubbles, and oil puddles.
What is iridescence.