The image shows two students modeling a light wave by continuously moving the ends of the rope up and down.

Question

Picture of a boy and girl shaking a rope up and down to model a transverse wave.
Source: Oxford Designers & Illustrators Ltd. Pearson Education Ltd

How would the waves change if the students continued moving the ends of the rope up and down the same distance but moved the ends faster?

(1 point)
Responses

The wavelength would increase and the amplitude would decrease, but the frequency would be unchanged.
The wavelength would increase and the amplitude would decrease, but the frequency would be unchanged.

The wavelength would increase and the frequency would decrease, but the amplitude would be unchanged.
The wavelength would increase and the frequency would decrease, but the amplitude would be unchanged.

The frequency would increase and the wavelength would decrease, but the amplitude would be unchanged.
The frequency would increase and the wavelength would decrease, but the amplitude would be unchanged.

The amplitude would increase and the frequency would decrease, but the wavelength would be unchanged.

Answer 1

When the students move the ends of the rope faster while maintaining the same distance of movement (amplitude), the frequency of the waves would increase. This is because they are creating more waves in a given amount of time. As a result, the wavelength would decrease because the wave speed remains constant, and speed is equal to frequency times wavelength (v = fλ).

So, the correct response is:

The frequency would increase and the wavelength would decrease, but the amplitude would be unchanged.

Answer 2

Which of these tasks is completed with infrared radiation? (1 point)
Responses

sending messages through fiber optic cables
sending messages through fiber optic cables

transmitting digital messages with a cell phone
transmitting digital messages with a cell phone

diagnosing a broken bone or decayed tooth
diagnosing a broken bone or decayed tooth

removing bacteria from the air in hospitals

Answer 3

The task that is completed with infrared radiation is:

removing bacteria from the air in hospitals.

Infrared radiation can be used for various purposes, including disinfection and sterilization, due to its ability to kill bacteria and other pathogens.

Answer 4

Why are X-ray telescopes placed in space, but not on Earth’s surface? (1 point)
Responses

X-rays are too powerful and dangerous to be used on Earth.
X-rays are too powerful and dangerous to be used on Earth.

Earth’s atmosphere deflects X-rays from space.
Earth’s atmosphere deflects X-rays from space.

Earth’s surface releases X-rays into the atmosphere.
Earth’s surface releases X-rays into the atmosphere.

A telescope in space is closer to the planets and stars.

Answer 5

The correct response is:

Earth’s atmosphere deflects X-rays from space.

X-rays cannot penetrate the Earth's atmosphere, which is why X-ray telescopes need to be placed in space to observe astronomical objects that emit X-rays.

Answer 6

How do microwave ovens use electromagnetic waves to cook food? (1 point)
Responses

The waves cause water molecules in food to vibrate and produce heat.
The waves cause water molecules in food to vibrate and produce heat.

The waves heat the air inside the oven enough to cook the food.
The waves heat the air inside the oven enough to cook the food.

The waves strike the surface of food, increasing its temperature.
The waves strike the surface of food , increasing its temperature.

The waves transfer energy to the walls of the oven to heat the inner area.

Answer 7

The correct response is:

The waves cause water molecules in food to vibrate and produce heat.

Microwave ovens use microwave radiation, a type of electromagnetic wave, which interacts particularly well with water molecules in food, causing them to vibrate and generate heat, thus cooking the food.