Which portion of the electromagnetic spectrum is used in a television?

Physics

1 answer:

vladimir1956 [14]3 years ago

3 0

<h2>Answer: Radio waves </h2><h2 />

Radio waves are a type of electromagnetic radiation with wavelengths between 10 m to 10,000 m. In the electromagnetic spectrum this wavelength is longer than infrared light and therefore, it goes beyond the visible spectrum.

This type of electromagnetic waves is very well reflected in the ionosphere, the layer of the atmosphere through which they travel directly or using repeaters.

In addition, they are very useful to transport information, being important in telecommunications. They are used not only for conventional radio transmissions but also in mobile telephony and TV.

It should be noted that since radio signals have large wavelengths, they can be diffracted around certain obstacles, such as hills and mountain ranges, preventing the signal from reaching its destination.

Therefore, the correct option is C.

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Heat naturally flows from an object that has a _______________ temperature to an object that has a _______________ temperature.

GaryK [48]

Answer:

higher, lower, external work, 100 %, work.

Explanation:

These paragraphs refer to the second law of thermodynamics. There are two statements for the second law of thermodynamics. They are as follows:

KELVIN STATEMENT:

All the heat from a source can never be transferred to the sink without the rejection of some heat.

CLAUSIUS STATEMENT:

Heat can not be transferred from a colder body to a hotter body without the application of som external work.

According to the statements the blanks can be filled as follows:

Heat naturally flows from an object that has a <u>higher</u> temperature to an object that has a <u>Lower</u> temperature. Heat can be made to flow in the reverse direction if <u>external work</u> is done. A machine can never have an efficiency of <u>100 %</u>. This means that heat energy can never be fully converted into <u>work</u> energy.