How are microwaves produced why microwaves are used in radar?

Microwaves are used in radars because they can pass through any object. The frequency of the microwaves lies between infrared waves and radio waves and covers a high range of frequencies. The microwaves are electromagnetic waves with high wavelength and low frequencies. So, it is used in radar to detect the objects.

How microwaves are produced?

Microwaves are produced inside the oven by an electron tube called a magnetron. The microwaves are reflected within the metal interior of the oven where they are absorbed by food. Microwaves cause water molecules in food to vibrate, producing heat that cooks the food.

How are microwaves transferred?

Just as radio waves can pass straight through the walls of your house, so microwaves penetrate inside the food. Vibrating molecules have heat so, the faster the molecules vibrate, the hotter the food becomes. Thus the microwaves pass their energy onto the molecules in the food, rapidly heating it up.

How are microwaves used in satellites?

Microwaves are used as they can pass through the atmosphere. This signal can be sent to a satellite and used to communicate around the world (more than one satellite is required for this).

How are microwaves produced physics?

Microwaves at a frequency of 2.45 GHz are produced by accelerating electrons. The range of microwave frequencies is specially selected so that the polar molecules, in trying to maintain their orientation with the electric field, absorb these energies and increase their temperatures—a process called dielectric heating.

How are microwaves used in the cellphones?

A cell phone encodes the sounds of the caller’s voice in microwaves by changing the frequency of the waves. The encoded microwaves then travel through the air to a cell tower and eventually to the receiver of the person being called. The receiver decodes the microwaves and changes them back to sounds.

How are microwaves produced class 12 physics?

(i) Microwave are produced by special vacuum tubes like the klystron / Magnetron, /Gunn diode. The frequency of microwaves is selected to match the resonant frequency of water molecules, so that energy is transferred efficiently to the kinetic energy of the molecules.

Where are microwaves produced?

Sources of Microwaves Microwaves are the highest-frequency electromagnetic waves that can be produced by currents in macroscopic circuits and devices. Microwaves can also be produced by atoms and molecules—e.g., they are a component of electromagnetic radiation generated by thermal agitation.

How are microwaves transmitted and where do the waves come from?

Microwaves are a form of electromagnetic radiation, just like light and radio waves. They come from applying a large voltage to a thing called a cavity magnetron, which involves the interactions of electrons with a magnetic field.

How microwaves are used in cooking radar and satellite communications?

Microwaves are commonly used in radar systems where radar uses microwave radiation to detect the range, distance, and other characteristics of sensing devices and mobile broadband applications.

How do microwaves work Physics GCSE?

Microwave ovens use a microwave frequency which is strongly absorbed by water molecules, causing them to vibrate, increasing their kinetic energy. This heats materials containing water, for example food. The radiation is kept inside the oven by the reflecting metal case and metal grid in the door.

What do microwaves transfer between a cell phone and a cell phone tower?

Microwave antenna systems on cell-phone towers relay signals between phones, or connect phones to the internet, using frequencies ranging from hundreds of MHz to tens of GHz, depending on commercial carrier and generation— 3G, 4G or 5G.

What is the difference between a microwave and a radar?

Microwaves are the energy waves between infrared (in what we consider the ‘heat’ range) and radio waves, below 300 GHz. So microwaves cover a huge range of frequencies from 300MHz to 300 GHz, which are equivalent to wavelengths from about 1millimeter to 1 meter. Radars send out a wave of energy…

Why are microwaves used to send signals to and from satellites?

Microwaves are used to send signals to and from satellites. The satellites can relay signals around the Earth. Microwaves are used because they pass through the atmosphere and through the ionosphere. The signals may be for television programmes, telephone conversations, or monitoring the Earth (for example,…

What is the source of radio waves in a microwave?

Magnetrons are the source of radio waves in a microwave oven. Radars can also use magnetrons, both as a source of radio waves (such as marine radars) and as high-power amplifiers (such as my artillery fire control radar).

How do microwaves travel through the atmosphere?

Microwaves travel by line-of-sight; unlike lower frequency radio waves they do not diffract around hills, follow the earth’s surface as ground waves, or reflect from the ionosphere, so terrestrial microwave communication links are limited by the visual horizon to about 40 miles (64 km).