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X ray waves are harmful if exposed frequently or for a long time because they penetrate into our body, in the process they cause damage to the cells in the body. This effect can also cause cancer.

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Q: What are the dangers of radar waves?
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What type of electromagnetic wave is used for radar?

It is microwaves that are used for radar. They are high frequency, short wavelength electromagnetic waves, and a number of different frequency ranges of these microwaves are used depending on the application. A link is provided to the Wikipedia article on radar and the different bands or ranges of frequencies that are used and their applications.


Give 5 differences between radar and sonar?

SONAR stands for Sound Detection and ranging, and RADAR stands for Radio Aid to Detection and Ranging. as described below (by richard), the principle is simple. Point a signal source in one direction, Listen for the echo to return, and time how long the return signal took, Divide it in two, and with some math, and knowing the speed of the wave, work out how far away the object is. Now if you make the sender/receiver directional. you can move it left and right, and see how wide the object is. If you can rotate it 360 degrees, you get a map of what is arround you. (Gavin)BY sending out a hi frequency pulse to an aircraft and detecting the timing for the return it can be calculate the speed and direction basically location of an aircraft. Sonar has the same principle applied timing of a response return PING to detect the location.Radar is a system that uses radio electromagnetic waves to provide a range to a target normal in air or a vacuum. RADAR propagates its radio waves at the speed of light. Sonar uses sound and propagates in pressure wave through water and the speed of sound. And provides a range to a target in a similar way, just at slow speed.


What did the radar do?

radar sends electromagnetic waves and it is reflected back by the object such as a plane or a sub and based on the analysis of time and speed of wave we get the position of object. for an example of radar they used radar before pearl harbor and saw many planes, the radar operatiors thought it was a squadron of b-29's returning to base but it ended up being the empire of japan's zero's (type of lightly armored plane that sacrificed armor for speed,agility,and a better service ceiling (how high a plane can go))


What is the principle of radar?

The basic idea behind radar is very simple: a signal is transmitted, it bounces off an object and it is later received by some type of receiver. This is like the type of thing that happens when sound echo's off a wall. However radars don't use sound as a signal. Instead they use certain kinds of electromagnetic waves called radio waves and microwaves. This is where the name RADAR comes from (Radio Detection And Ranging). Sound is used as a signal to detect objects in devices called SONAR (Sound Navigation Ranging).


Why can aluminium jam radar?

Radar waves can pass through many substances (they appear transparent like glass) but are reflected efficiently by metals (which act more like a mirror to radar). Thus if you want to confuse a radar system you can scatter a mass of thin, light aluminium confetti in the air and this will appear as a fog, hiding the target (your plane) from the enemy. Aluminium is used because it is a light metal that can be made into thin sheets or ribbons (aluminium foil).