Sumner Waves

Which choice BEST represents the sound waves from a soft low-pitched train rumble that suddenly shifts to a loud, high-pitched squeal of brakes?

• A

• B

• C

• D

Many new headphones on the market are called "noise reducing" because they take sound waves that come in from the outside and add a sound wave to it that is exactly opposite (out of phase) to it, these add together to make no noise. This is a good example of sound wave

• absorption

• diffraction

• destructive interference

• constructive interference

In old western movies, cowboys often would put their ear to a train track to listen for an oncoming train. What benefit would this method provide over listening for a train by listening for sound through the air?

• The sound would be louder

• The sound would be undistorted.

• The sound would reach him sooner

• The sound would higher in frequency

Ultraviolet rays are more likely to give you a sunburn than visible light. What statement would be the best possible explanation for this?

• Visible light cannot penetrate the skin.

• Ultraviolet rays have a higher frequency and therefore have more energy.

• Visible light has a broader range of frequencies and amounts of energy.

• Ultraviolet rays have a longer wavelength and therefore have more energy.

You see an image of yourself in a mirror because light waves are

• diffracted.

• reflected back at you.

• refracted through air.

• refracted to a focal point.

The leaves of a plant appear to be green because light waves are

• reflected

• absorbed

• both absorbed and reflected

• neither absorbed or reflected

Although you can see the pencil, it appears broken in the glass of water. This is because

• electromagnetic waves cannot travel through solids.

• electromagnetic waves travel at different speeds through different media.

• electromagnetic waves compress more when they travel through denser media.

• electromagnetic waves get closer together when they go through dense media like glass.

Assume the light wave directed at the paper is white light and the paper contains pigments that absorb the wavelengths of red-orange-yellow-green-blue-indigo-violet. What color will the paper appear to human eyes?

• black

• brown

• green

• white

Nina’s measurements, shown in the table here, BEST represent a wave with

• decreasing frequency.

• increasing frequency.

• increasing amplitude.

• decreasing amplitude.

Sound waves with a large distance between A and B would be sound waves that have a large ________ and produce loud sounds.

• amplitude

• frequency

• pitch

• resonance