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3 years ago

PLZ HELP

Physics

1 answer:

Vitek1552 [10]3 years ago

8 0

1st

Cell phones depend on both mechanical and electromagnetic waves to be useful. Which answer below correctly identifies how each wave is used in cell phones?

Correct option

Mechanical waves allow the cell phone to emit a sound when ringing; Electromagnetic waves allow a signal to be picked up when making a call.

(Mechanical waves, made by oscillating a membrane inside the phone are responsible for sound. While electromagnetic waves, such as radio signals, allow us to make phone calls)

2nd

True or False. The Electromagnetic Spectrum can be described in terms of wave energy, frequency, and wavelength.

Correct option

True because the electromagnetic spectrum is ordered based on wave energy, which is described on a wave as wavelength and frequency.

(These are the basic characteristics of an electromagnetic wave, and depending of the frequency, they carry an specific amount of energy.)

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"What kind of electromagnetic radiation can be detected by a human body? I) visible light II) infrared light III) ultra-violet l

Vinvika [58]

Answer:

7. I and III only.

Explanation:

Only portions of the electromagnetic spectrum is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light which have wavelengths from about 390 to 750 nm that is; ultraviolet light and visible light.

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2 years ago

Why are scientific models important?

Wittaler [7]

Answer:

Scientific models are representations of objects, systems or events and are used as tools for understanding the natural world. Models use familiar objects to represent unfamiliar things. Models can help scientists communicate their ideas, understand processes, and make predictions.

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2 years ago

A student walks 4 km in 30 minutes. What is the student’s average speed in km/h? Be sure to include your units. Please help!!!!!

VladimirAG [237]

4 km in 30 min then 8 km in 60min or an hr. so 8km/hr.

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2 years ago

Someone please help? :)

Gnoma [55]

Answer:

(A) $F_N - mg\cos\theta$

Explanation:

The net force perpendicular to the surface of the incline is the sum of the gravity force component, which is mgcos(theta), and the reactionary normal force caused by the surface of the incline. The sum is F_N - mgcos(theta) and is usually 0 which is why the object is not moving perpendicularly to the surface of the incline.

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3 years ago

What tools enable people to connect and exchange ideas

aleksklad [387]

Answer:

The answer is: "Social Media tools"

Explanation:

"Social Media tools" are <u>very popular tools being used by the modern generation these days.</u> They come in different types according to their usage (Listening Platforms, Publishing Platforms and Competitive Analysis Platforms). Examples of these are: <em>Hootsuite, Buffer, Oktopost, Canva, Google Trends, BuzzSumo, etc.</em>

These tools allow people to interact with one another. People can published the information they want to share and distribute this information to other people. Marketers also use these tools in order to aid them regarding online businesses and the like. Some social media tools are available for free while others have to be purchased.

Thus, this explains the answer.

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3 years ago