Q:

Who invented radar?

A:

Quick Answer

In 1886, Heinrich Hertz demonstrated that radio waves that hit objects are reflected, and in 1897, the first accidental radar detection of a ship was performed by Alexander Popov. In 1904, Christian Hulsmeyer made a practical demonstration of intentional detection of metallic objects using a radar.

 Know More

Full Answer

In 1936, a prototype radar was demonstrated in New York City and detected aircraft from up to 7 miles away. After witnessing the demonstration, the Secretary of War ordered the prototype to be fully developed, and Congress offered $250,000 as funds for its development. The U.S. Army deployed the first fully developed model in 1941 in Hawaii. On Dec. 7, 1941, at 7:02 a.m., the recently installed radar detected aircraft north of its position, and the information was sent to the aircraft warning center. However, the information was misinterpreted as friendly bombers, and 46 minutes later, Pearl Harbor was attacked by Japanese aircraft.

Learn more about Optics & Waves

Related Questions

  • Q:

    What are some disadvantages of radio waves?

    A:

    One of the disadvantages of radio waves is that they cannot transmit a lot of data simultaneously because they're low frequency. In addition, continued exposure to large amounts of radio waves can cause health disorders like leukemia and cancer. Despite these setbacks, technicians have effectively achieved enormous breakthroughs. For example, astronauts use radio waves to transmit information from space to Earth and vice versa.

    Full Answer >
    Filed Under:
  • Q:

    What are the dangers of radio waves?

    A:

    In large doses, radio waves, also known as radio frequencies, can disrupt biological functions and break down tissue. There is still much debate over whether or not the radio frequencies emitted from mobile communication devices and the systems that support them pose any danger.

    Full Answer >
    Filed Under:
  • Q:

    What is radar used for?

    A:

    Radar is used to detect the presence of moving or stationary objects at a distance by utilizing radio waves. It is also used to detect the speed of a moving object, to identify the type and bearing of an aircraft and to create detailed topographic maps.

    Full Answer >
    Filed Under:
  • Q:

    Where was the radio invented?

    A:

    There is no singular place where radio was invented because its creation was based on work by Nikola Tesla, Guglielmo Marconi, Heinrich Hertz and Mahlon Loomis. Marconi gets much of the credit for the radio, but his work was partly based on Tesla’s work.

    Full Answer >
    Filed Under:

Explore