Waves

Were the beeps that came from sputnik sound waves broadcast from the ship, or were the beeps something else?

• The spaceship was broadcasting sound waves. Because there are no molecules in outer space, there was nothing to block the sound from reaching the Earth.

• They were sound waves, but you could only hear them if you were very, very quiet.

• They had to be something else because sound waves cannot travel in the vacuum of space.

• They could not have been sounds, because speakers hadn't been invented yet.

Why do you have to aim 'under' a fish when spearfishing or bowfishing in a lake or pond?

• When the fish sees you moving, it almost always swims toward you.

• When spears or arrows hit the water surface, they 'skip' a little and hit further away than where you aim them.

• Light travels at the same speed and direction through air and water. You aim low because most people naturally shoot high.

• Light travels more slowly and at a different angle in water than in air making the fish appear further away than it is.

As the pelican flies above the water's surface, why must it aim for the fish in a slightly different place than where the fish appears to be located?

• Light reflects off the fish, except for light of the wavelength the fish absorbs, making the fish hard to see.

• Water absorbs most of the light, so not much light reaches the pelican's eyes.

• Energy from the ocean waves is transferred to the light waves.

• Light waves are refracted as they travel from air to water.

Tags

NGSS.MS-PS4-2

Which of the following statements best explains why there is a time lapse between seeing the baseball hit and hearing it?

• Eyes reacting to stimuli faster than ears do.

• Light waves travel in a more direct path than sound waves.

• Light waves travel faster in the air than sound waves do.

• Sound waves from other sounds cause interference with sound waves from the bat.

Why could Jacob see the tree's reflection when the water was still, but not when it was disturbed?

• The disturbed surface made the light waves refract in many directions, breaking up the image.

• The disturbed surface allowed some of the light waves to penetrate into the water, making gaps in the image.

• The disturbed surface kept the light waves from reflecting, making it impossible to see an image.

• The disturbed surface changed the light waves' wavelengths, changing the reflected image.

Tags

NGSS.MS-PS4-2

What is the reason for the difference in how the straw looks above and below the water?

• Light travels faster through water, refracting the image of the straw.

• The surface of the water reflects the image of the straw.

• Light travels faster through air, refracting the image of the straw.

• The light is reflected several times in the glass, creating a false image.

Tags

NGSS.MS-PS4-2

Which best explains why Yvonne sees the spoon as broken when she looks at it under the water?

• Light bounces off the spoon and causes refraction inside the water.

• The water in the glass absorbs the light, causing a reflection on the spoon.

• The water reflects light back out of the glass bending as it travels around the spoon.

• Light traveling through the air slows down when it moves through the water, causing it to refract.

Tags

NGSS.MS-PS4-2

What happens to the wavelength and frequency as you move along the electromagnetic spectrum from radio waves to gamma waves?

• frequency increases and wavelength decreases

• frequency decreases and wavelength decreases

• frequency increases and wavelength increases

• frequency decreases and wavelength increases

Tags

NGSS.HS-PS4-1

What is the best explanation for the observation that the underwater portion of the red straw seems bent and swollen?

• Red light traveling from the straw passes through the air in a straight line and at the speed of light, but the light traveling through the water slows down and changes direction.

• When you place the straw in the water it swells slightly and moves to the side, only to return to its original size and shape when you remove it.

• The straw looks larger and broken because the light bounces around several times inside the glass before finally leaving the water.

• The speed and direction of light never changes. Red light traveling from the straw passes through air or water at the same speed. It is your brain that creates the illusion.

Tags

NGSS.MS-PS4-2

Which is the best and safest way for the astronaut to get the other astronaut's attention?

• By tapping two metal wrenches together.

• By flashing her light on his face.

• By shouting as loudly as she can.

• By throwing her wrench at him.

Tags

NGSS.MS-PS4-2