Y is which letter of the English alphabet?
Answer25th
Y comes just before Z, the 26th letter.
Science · Facts & stats
Y facts & stats
7 fact-checked facts about curiosity and the science behind everyday 'why' questions, plus the letter Y, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Why is the daytime sky blue?
AnswerAir scatters blue light more than red light
Shorter blue wavelengths scatter more in the atmosphere.
Going deeper
Why do we have leap years?
AnswerEarth's orbit takes about 365.25 days
An extra day every four years keeps calendars aligned with the seasons.
Why do many leaves change color in autumn?
AnswerChlorophyll breaks down, revealing other pigments
As green chlorophyll fades, yellow and orange pigments show.
What did 'Y2K' refer to?
AnswerComputer date problems expected at the year 2000
Many systems stored years as two digits, risking errors in 2000.
Expert level
What is the name of the effect that scatters blue light in the sky?
AnswerRayleigh scattering
Rayleigh scattering is stronger for shorter wavelengths.
Yttrium is named after Ytterby, a village in which country?
AnswerSweden
Ytterby, near Stockholm, gave its name to four elements.
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