Why are microwaves used in radar?

Hint:Microwaves are electromagnetic waves having high frequency and small wavelength. So, it is used in radar to determine the speed, distance and motion of the objects.

Complete step by step answer:
Microwaves are electromagnetic waves having some frequency of $1GHz$ to $300\;GHz$. The wavelength of the microwaves is smaller, so they can be transmitted as a beam signal in the desired directions. And also, microwaves do not change their path when it collides with any object. The microwaves may reflect from the object but it cannot change their path. Hence, it is used in radar.
Radar is the device used for detecting the presence, distance, direction and velocity of the moving object and also used for detecting the objects at rest. In radar, the transmitter transmits the microwaves in all directions, the microwaves are reflected from the object and the receiver receives back the microwaves. So, the radar detects the object.

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. So, the microwaves are used in the radar. The wide range of frequencies of microwaves helps to detect the fast-moving objects like aircraft, rockets, ships etc.

Significance of Microwaves:
The microwaves are reflected back and the receiver receives the microwaves, the frequency of the reflected waves is used to determine the speed and distance of the objects.
The microwaves are electromagnetic waves with high wavelength and low frequencies. So, it is used in radar to detect the objects.

Application of microwaves:
Microwaves are used in radar to find the objects like ships in underwater, aircrafts, missiles, etc. The radar used in ships which transmits the microwaves in the water to determine the motion of the object under the water. So, that the microwaves are transmitted in any medium.

Note:
Microwaves are widely used in modern technology such as wireless networks, microwave ovens, etc. Microwaves are used in medical application for cancer treatment.