The word 'digital' comes from the Latin 'digitus', meaning what?
AnswerFinger or toe
People counted on their fingers, so 'digit' came to mean both a finger and a single numeral.
Tech · Facts & stats
Digi facts & stats
7 fact-checked facts about digital technology basics, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does 'pixel' stand for?
AnswerPicture element
A pixel is the smallest dot of color that makes up a digital image or screen.
Going deeper
What is the binary number 1010 equal to in decimal?
Answer10
1010 = 1×8 + 0×4 + 1×2 + 0×1 = 10.
What is the key difference between analog and digital signals?
AnswerAnalog varies continuously; digital uses separate, discrete values
Analog signals change smoothly like a wave, while digital signals are stored as a series of distinct numbers.
Standard audio CDs sample sound how many times per second?
Answer44,100
CD audio uses 16-bit samples at 44.1 kHz, enough to capture the full range of human hearing.
Expert level
By the Nyquist–Shannon sampling theorem, a signal must be sampled faster than what rate to be captured accurately?
AnswerTwice its highest frequency
Sampling too slowly causes aliasing, where high frequencies falsely show up as lower ones.
How many different values can a 16-bit binary number represent?
Answer65,536
Each extra bit doubles the number of values, and 2^16 = 65,536.
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