Question

Why are infrared telescopes placed on satellites, rather than on Earth’s surface?(1 point)
Responses

Because telescopes on Earth’s surface vibrate in response to small seismic waves.
Because telescopes on Earth’s surface vibrate in response to small seismic waves.

Because infrared radiation from animals and soil overwhelms the signal on Earth’s surface.
Because infrared radiation from animals and soil overwhelms the signal on Earth’s surface.

Because light pollution affects too much of Earth’s surface.
Because light pollution affects too much of Earth’s surface.

Because Earth’s atmosphere absorbs most infrared radiation.

Which type of wave is caused by the acceleration of an electric charge?(1 point)
Responses

mechanical
mechanical

electromagnetic
electromagnetic

elastic
elastic

surface

What happens to the kinetic energy of the particles in the medium when a wave is absorbed?(1 point)
Responses

It becomes zero.
It becomes zero.

It increases.
It increases.

It decreases.
It decreases.

It remains the same.

Which of the following principles is used in the design of lenses?(1 point)
Responses

refraction
refraction

diffraction
diffraction

illumination
illumination

reflection

Which term describes emitted light that is in phase?(1 point)
Responses

incandescent
incandescent

laser
laser

ultraviolet
ultraviolet

fluorescent

Answer 1

1. **Why are infrared telescopes placed on satellites, rather than on Earth’s surface?**
- **Because Earth’s atmosphere absorbs most infrared radiation.**

2. **Which type of wave is caused by the acceleration of an electric charge?**
- **electromagnetic**

3. **What happens to the kinetic energy of the particles in the medium when a wave is absorbed?**
- **It decreases.**

4. **Which of the following principles is used in the design of lenses?**
- **refraction**

5. **Which term describes emitted light that is in phase?**
- **laser**