EM Spectrum
The speed of light is _______.
300,000,000 m/s
OR
3*10^8 m/s
Sound travels fastest in a _______ (solid, liquid, or gas) because of the DECREASED distance between the particles.
SOLID
When waves bounce off of an object
What is reflection
Which type of waves cause the most damage?
Surface Waves
We see the color of a red apple because the apple _________ red ? ( absorb or reflect)
Name the 7 types of electromagnetic radiation... in order
Radio Waves, Microwaves, Infrared Waves, Visible Light, Ultraviolet, X-rays, Gamma Rays
How much of a wavelength does 1 harmonic represent?
Half of a full wavelength
When a wave passess through mediums of different densities, it bends.
What is refracted
What are the main causes of tsunamis?
Earthquakes, Volcanic Eruptions, and Meteors.
What section of electromagnetic waves are used most commonly in communications?
Microwave or Radio
What color of light has the longest wavelength (least amount of energy)?
Red
What is the type of wave that makes up sound waves?
Longitudinal
An object that is ____________ cannot be seen through. ( Opaque, Transluent, Transparent)
What is opaque?
How many times stronger is a 7.0 compared to a 4.0 on the richter scale?
1000x stronger
What do we call it when the frequency, amplitude, or phase of a wave is slightly altered?
Wave Modulation
What is the most dangerous part of the EM spectrum that can harm us?
Gamma Rays
Why can't sound travel in space or a vacuum?
Sound must have atoms (especially gas atoms) in order to travel, and there are no atoms in a vacuum or space.
If the angle of incidence is 75˚, what is the angle of reflection?
75˚
Primary waves are faster
Primary waves can travel through liquids and gasses, secondary can not
Primary are longitudinal while secondary are transverse
Explain the difference between additive and subtractive colors?
Additive colors combine red, green, or blue to make brighter colors
Subtractive colors remove red, green, or blue making darker colors.
The speed of a wave is measured by how close the crests are or _________ measured in Hz. This is also inversely related to wavelength.
Frequency
A 6th harmonic standing wave is on a 12 cm string. how long is the wavelength?
4 cm
Explain how a Mirage happens?
Light is refracted through less dense hotter air near the ground and bent upwards.
What do we call the areas which do not experience seismic waves from an earthquake across the globe?
Shadow Zones
If the velocity of our wave is a constant, and the wavelength triples, what happens to the frequency?
The frequency is divided by 3