Unit 4 Section B.1 B.2 and B.7

1. Write a sentence that describes the relationship between the frequency of electromagnetic radiation and its energy.

High-frequency radiation is also high-energy radiation

2.Why is the world spectrum a good descriptor of the types of energy found in electromagnetic radiation

Because it shows the different lengths of the waves.

3. Why is visible light useful in plant photosynthesis, while other forms of electromagnetic radiation is not?

Because visible light can energize electrons in some chemical bonds, and UV-C is not useful because it can kill the blant

4. List the main types of electromagnetic radiation in order of increasing energy

Infrared Radiation

Visible Radiation

UV-A

UV-B

UV-C

b.Describe how each type of radiation listen in your answer affects living

Infrared Radiation: Is Electromagnetic radiation with frequencies slightly lower than that of red light. Cause certain bonded atoms to vibrate more energetically

Visible Radiation:Can energize electrons in some chemical bonds

UV-A: Has the longest wavelengths, and thus has the lowest energy

UV-B:Has more enter, it can cause sunburn; and, with long-term exposure, it is linked to skin cacao

UV-C: The most energetic form of ultraviolet radiation, is useful for sterilizing materials because it can kill bacteria and destroy viruses, has enough energy to break covalent bonds

5. Ultraviolet light is often used to sterilize chemistry laboratory proactive goggles. Why is ultraviolet light effective for this use. while visible light in not.

Because ultraviolet light can kill bacteria.

6. Compare infrared, visible and ultraviolet radiation in terms of how well they are absorbed by the atmosphere

Infrared radiation from the sun cannot reach Earth's surface because it is absorbed by CO2 and gaseous H2O.

Visible radiation, on a clear day more than 90% of the visible region of solar radiation directed toward Earth travels down to Earth's surface

Ultraviolet radiation, Most UV-B radiation and UV-A radiation does not reach the Earth's surface because it is absurd by the stratospheric ozone layer.

7. Describe two main effects of the solar radiation that reaches Earth surface

Visible radiation, which provides the energy needed for photosynthesis reaction

and ultraviolet, which causes sunburns, and longterm causes skin cancer

8. a. compare lake water and asphalt in terms of how readily each warms up when exposed to sunlight

The lake water would be more warm because it absorbs 70% of the solar radiation, and the solar radiation reflects of the asphalt only 30% of solar radiation is reflected.

b.What properties of these two materials account for difference in their behavior

The asphalt doesn't ever actually absorb the heat, it only reflect it, unlike the water, which actually absorbs it.