Some frequencies of ultraviolet light have enough energy to kill bacteria, but do not have enough energy to go through or damage human tissue. Which one of the medical applications below would this type of electromagnetic radiation be most useful?(1 point)

Question

Responses

to remedy errors in vision
to remedy errors in vision

to target and destroy cancer cells
to target and destroy cancer cells

to reconstruct a tooth
to reconstruct a tooth

to sanitize surgical rooms

A scientist is creating a device for humans to communicate through detectable light. Which waves should the scientist apply from the electromagnetic spectrum?(1 point)
Responses

visible waves
visible waves

radio waves
radio waves

X-ray waves
X-ray waves

infrared waves

A scientist is designing a device that will develop an image of a bone, but not the surrounding tissues. Which type of wave from the electromagnetic spectrum would best complete the scientist's design and why?(1 point)
Responses

X-ray waves would be the best choice because they have short wavelengths.
X-ray waves would be the best choice because they have short wavelengths.

Infrared waves would be the best choice because they have large amplitudes.
Infrared waves would be the best choice because they have large amplitudes.

X-ray waves would be the best choice because they have long wavelengths.
X-ray waves would be the best choice because they have long wavelengths.

Infrared waves would be the best choice because they have small amplitudes.
Infrared waves would be the best choice because they have small amplitudes.

Jo’Siah wonders if he can block the radio waves emitted by the remote control used to operate his radio-controlled car. He covers the remote control in different materials and tries to use it to operate his car. His observations are recorded in the table below.

materials observations
cotton remote control works
aluminum foil remote control does not work
plastic wrap remote control works
wax paper remote control works

Why does the remote control work with all the materials except when covered with aluminum foil?

(1 point)
Responses

because the aluminum foil blocks the batteries
because the aluminum foil blocks the batteries

because the aluminum foil blocks the gamma rays
because the aluminum foil blocks the gamma rays

because the aluminum foil blocks the radio waves
because the aluminum foil blocks the radio waves

because the aluminum foil blocks the sound waves

High-energy radiation from the Sun can cause damage to the cells of living things. Earth's atmosphere protects us from much of the Sun's harmful radiation. Which of the following is NOT a type of high-energy radiation that is reflected or absorbed by Earth's atmosphere?(1 point)
Responses

X-ray radiation
X-ray radiation

microwave radiation
microwave radiation

ultraviolet radiation
ultraviolet radiation

gamma radiation

Answer 1

Here are the answers to your questions:

1. Which one of the medical applications would this type of electromagnetic radiation be most useful?

   • Response: to sanitize surgical rooms.
     This is because ultraviolet light can kill bacteria effectively without penetrating or damaging human tissues.

2. Which waves should the scientist apply from the electromagnetic spectrum for communication through detectable light?

   • Response: visible waves.
     Visible light is the most suitable for communication as it can be detected by the human eye.

3. Which type of wave from the electromagnetic spectrum would best complete the scientist's design to develop an image of a bone?

   • Response: X-ray waves would be the best choice because they have short wavelengths.
     X-rays can penetrate soft tissue and are absorbed by denser materials like bone, making them ideal for imaging.

4. Why does the remote control work with all the materials except when covered with aluminum foil?

   • Response: because the aluminum foil blocks the radio waves.
     Aluminum foil acts as a shield against radio waves, preventing the remote control from communicating with the car.

5. Which of the following is NOT a type of high-energy radiation that is reflected or absorbed by Earth's atmosphere?

   • Response: microwave radiation.
     Microwave radiation is generally not considered high-energy radiation and is not significantly blocked by Earth's atmosphere compared to X-rays, ultraviolet radiation, and gamma radiation, which are absorbed or reflected.

Feel free to ask if you have further questions!