2.3 Waves, Sound and Light Energy Review

Front

What does the picture show?

Back

It shows white light passing through a prism and separating into a visible spectrum.

Front

What is the major source of energy for life on earth that is unlimited?

Back

the sun

Front

Why does exposure to UV waves in sunlight pose a health risk compared to visible light?

Back

UV waves are higher frequency and carry more energy.

Front

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. UV radiation is called ultraviolet because it has a frequency which is higher than violet radiation (purple light). Therefore, it has a wavelength which is __________ than violet radiation.

Back

shorter

Front

What is the best explanation for the blue color of the ocean?

Back

When white light from the sun strikes the ocean's surface, the elements of the visible spectrum with longer wavelengths are absorbed more than those with short wavelengths.

Front

If you put a straw into a glass of water, the straw looks to be bent, although nothing has really happened to the straw. The term that describes this property of light is

Back

refraction.

Front

Why does light behave as shown in the image when it passes from air to glass?

Back

Light slows down when it passes into a denser medium.

Front

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

Back

reflected back at you.

Front

If a laser beam travels from air into water, what happens to its speed and direction?

Back

It slows down and bends towards the normal.

Front

Based on the data in the table, what can we reasonably conclude about the speed of sound through various materials?

Back

The speed of sound is higher in solids than in liquids.