1.Mouths are quiet.

2.Begin the quick review section of your notes.

3.Raise your hand if you need something.

Quick Review1.

Quick Review2.

Lesson 3.10 – UV and High Energy Waves

Energy

I can describe ultraviolet light and high energy waves (x-ray and gamma) and how they impact living things. (2e)

1. Waves with higher energy = more damaging to living things.

a. Higher energy waves = higher frequency and shorter wavelength.

I can describe ultraviolet light and high energy waves (x-ray and gamma) and how they impact living things. (2e)

Type of Wave

Description

Impact on Life

Ultraviolet (UV) Light

Higher energy than visible light

Can make certain substances glow.

Not visible to humans, but some animals can detect it.

Lots of exposure can cause sunburns, cell damage, and eventually skin cancer.

Can kill bacteria cells.

I can describe ultraviolet light and high energy waves (x-ray and gamma) and how they impact living things. (2e)

Type of Wave

Description Impact on Life

X-Rays

High energy Can travel

through soft tissue like skin, but not through bone

Lots of exposure can damage cells and DNA specifically.

Used in medicine and airport security.

Type of Wave

Description Impact on Life

Gamma Rays

Highest energy

Produced by the sun and other stars

Very damaging to cells and DNA.

Used to sterilize medical equipment by killing bacteria and viruses.

I can describe ultraviolet light and high energy waves (x-ray and gamma) and how they impact living things. (2e)

3. While gamma rays and x-rays can damage healthy cells in humans, they can also be used by doctors to kill cancer cells.

I can describe ultraviolet light and high energy waves (x-ray and gamma) and how they impact living things. (2e)

Which waves are harmful to cells? Ultra-Violet Rays X-Rays Gamma Rays

ROAD CHECK

Which waves can cause skin cancer?

Ultraviolet Rays = UV Rays

ROAD CHECK

WORK WITH US…NOT AHEAD OF US!

Guided Practice

Guided Practice1. Gamma rays have a shorter wavelength than x-ray waves. Compare the energy transferred by an x-ray to that transferred by a gamma ray.Gamma rays transfer more energy than x-rays because they have a higher frequency and thus transfer more energy. 

Guided Practice2. Visible light waves have a longer wavelength than x-ray waves. Compare the energy transferred by an x-ray to that transferred by a visible light wave.Visible light has a longer wavelength and thus a lower frequency so it transfers less energy. 

Guided Practice3. A wave is classified as a gamma ray. What is the range of possible wavelengths for this wave?The wavelengths of a gamma ray range from 10-2 nm to 10-6 nm.

 

Guided Practice 4. A wave is classified as an x-ray. What is the range of possible wavelengths for this wave?The wavelengths of an x-ray range from 10 nm to 10-2 nm.

Quiz Study Guide (Important for Monday’s Quiz!)Do you know what that means?

• 1.) AC stands for: • Alternating current• Current can be easily transformed

from higher to lower voltage• Current changes magnitude and

direction in time

• 2.) DC stands for: • Direct current• Current flows in one direction• Used in batteries!

• 3.) Which three types of electromagnetic waves are damaging to the human body?

• 4.) Newton’s 1st Law: • Law of Inertia: “A body at rest

tends to remain at rest, and a body in motion tends to remain in motion, unless acted upon by an unbalanced force

• 5.) Newton’s 2nd Law: • Force = mass x acceleration

• 6.) Newton’s 3rd Law: • Action-Reaction Law: for every

action there is an opposite and equal reaction

• 7.

• 8.

• Additional topics:• Applying Newton’s Three Laws• Speed equation• Velocity equation• Acceleration equation

(5 Questions)

Exit Ticket

1. Which of these describes a wave with the most energy?

A. Low frequency, long wavelength

B. Low frequency, short wavelength

C. High frequency, long wavelength

D. High frequency, short wavelength

2. Which of these waves is the least dangerous to humans?

A. UV light wavesB. Gamma raysC. X-raysD. All three waves are equally

dangerous.

3. Which of the following waves is safe for humans to be exposed to?

A. Gamma raysB. X-raysC. UV light wavesD. Radio waves

4. Which of these does NOT describe ways in which UV light waves, x-rays, and gamma rays can be used to help humans.

A. Can be used to kill cancer cells.B. Can be used in medical imaging.C. Can be used to damage DNA,

causing skin burns.D. Can be used to kill bacteria in

supermarkets.

5. Which of the electromagnetic waves below could be used to kill bacteria in a city’s water?

A. Infrared light wavesB.Radio wavesC.Visible light wavesD.Ultraviolet light waves