10 most difficult elec­tron­ics riddles

The Ku band is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). Ku band is primarily used for satellite communications, most notably for fixed and broadcast services, and for specific applications such as NASA's Tracking Data Relay Satellite used for both space shuttle and International Space Station

A Nipkow disk is a mechanical, rotating, geometrically operating image scanning device, patented in 1885 by Paul Gottlieb Nipkow. This scanning disk was a fundamental component in mechanical television through the 1920s and 1930s.

A barcode is an optical, machine-readable, representation of data; the data usually describes something about the object that carries the barcode. Initially, barcodes were only scanned by special optical scanners called barcode readers. Later application software became available for devices that could read images, such as smartphones with cameras.

In 1930, Paul and Joseph Galvin together with William Lear developed the first car radio on the dashboard and called it "Motorola". The word "Motorola" meant "sound in motion". The first part pointed to the engine, the second part was the popular suffix "ola"

Typical parking sensors are ultrasonic, often a clicking sound may be heard close by. There are also less popular electromagnetic sensors, that do not require any holes in the bumper, but detect metal objects only.

Any lead-acid battery system when overcharged will produce hydrogen gas by electrolysis of water. If the rate of overcharge is small, the vents of each cell allow the dissipation of the gas. A severe overcharge may produce a flammable concentration of hydrogen.

Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound.

Samsung started out as a small trading company with forty employees located in Su-dong.

The transistor heralded in the “Information Age” and paved the way for the development of almost every electronic device, from radios to computers to space shuttles. For their monumental “researches on semiconductors and their discovery of the transistor effect,"4 Bardeen, Shockley and Brattain were presented with the Nobel Prize in Physics in 1956.

HTC was founded in 1997 as a manufacturer of notebook computers. The company changed name to HTC and doesn't use "High Tech Computer" name any more. However, some HTC smartphones are still visible as "High Tech Computer" devices when plugged into a PC.