two students are modeling a light wave by continuously moving the ends of the rope up and down. 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?

Question

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

Answer 1

If the students move the ends of the rope up and down the same distance but move the ends faster, the following changes occur in the resulting waves:

• Frequency: The frequency of the wave would increase because the ends of the rope are creating more wave cycles in the same amount of time.
• Wavelength: Since the speed of the wave is related to both frequency and wavelength (wave speed = frequency × wavelength), an increase in frequency while keeping the wave speed constant means the wavelength must decrease.
• Amplitude: The amplitude (the height of the wave) would remain unchanged since the students are moving the ends of the rope the same distance up and down.

Therefore, 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

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

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

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 is commonly used in various applications, including sterilization processes in medical settings. While other tasks listed involve different technologies (such as radio waves for cell phones and signals for fiber optic cables, or X-rays for diagnosing bones and teeth), infrared radiation is indeed utilized for disinfecting and purifying air.

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

Earth’s atmosphere deflects X-rays from space.

Answer 5

The correct response is:

Earth’s atmosphere deflects X-rays from space.

X-rays do not penetrate the Earth's atmosphere effectively, which is why X-ray telescopes need to be placed in space. This allows them to observe celestial objects that emit X-rays without interference from atmospheric absorption or scattering.

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

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

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

Answer 7

The correct response is:

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

Microwave ovens use electromagnetic waves, specifically microwaves, to excite water molecules in the food. This vibration generates heat, which cooks the food from the inside out.

Answer 8

Which of these tasks is completed with infrared radiation?
Responses

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

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

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

removing bacteria from the air in hospitals

Answer 9

The task that is completed with infrared radiation is:

removing bacteria from the air in hospitals.

Infrared radiation is used in various applications, including sterilization and air purification methods that target bacteria. The other tasks listed utilize different types of radiation or technologies. For example, cell phone communications typically use radio waves, fiber optic cables utilize light waves (usually in the visible spectrum), and diagnosing bones or teeth is usually done using X-rays.

Answer 10

no, sorry its sending messages through fiber optic cables

Answer 11

Apologies for the confusion! However, fiber optic cables primarily use visible light or near-infrared light, rather than strictly infrared radiation, to transmit data.

In fiber optics, light signals are transmitted through the glass fibers to carry information over long distances with minimal loss. This light can include some infrared wavelengths but is not solely limited to infrared radiation.

That said, if the focus is specifically on infrared as a broader category that includes wavelengths used in fiber optic communication, then your answer is valid in the context of the technology.

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