1 / 9 |
440 Hertz is the frequency that corresponds to the pitch of the musical note ‘A’ in the middle of a standard Piano. In 1975, the International Organization for Standardization made it the standard worldwide. Both the US time station and the BBC Broadcast this 440 Hz signal every hour for what purpose?

Answer : So that musicians can tune their instruments.

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2 / 9 |
The wavelength of 625-750 nanometres in the visible spectrum is one of the most easily recognisable colours. Being at the higher end of the spectrum, it has the highest wavelength, which means it can be seen from further away than others. What colour does this wavelength correspond to?

3 / 9 |
Language comes from the spoken word, and it evolves through the frequencies which are made by the vocal cords. A specific group of letters from the alphabets are predominantly found in the 2 kHz – 4 kHz range across all languages. What are these letters which are in that frequency because the vocal tract is constricted?

4 / 9 |
The village of Kongthong in Meghalaya is built on very hilly terrain. For hundreds of years, they have had a certain practised when naming a child, to ensure that they can be summoned in these areas. What high frequency practise is this?

Answer : Each child gets a signature whistle

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5 / 9 |
A Day in the Life is a song by the Beatles released in 1967. It has two significant audio bits at the end. The first is a 40-second crescendo (which inspired the THX note). It is followed by a 15-kHz tone, which humans can’t hear, but can purchase an instrument that can make the sound and summon a pet. What did Paul McCartney use to make this tone?

Answer : Dog whistle, for his sheep dog

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6 / 9 |
This brass instrument has two records in the orchestra. It is both the largest and lowest-pitched instrument in the brass family. What instrument is this which is used to play a 16Hz C in William Kraft’s piece ‘Encounters II’ (a note so low we can’t hear but feel it)?

7 / 9 |
This colour is at the short end of the visible spectrum with a wavelength of 380-450 nanometers. It and its shades have been historically associated with royalty, as it was a tough dye to make. What colour is this, and what is the name given to the dangerous wavelengths just shorter than this?

8 / 9 |
This section of light has a wavelength between 780 nm to 1mm, and though we can’t see it, we experience it as heat. Most remote controls use this to function. What is this radiation which gets its name because of where it is found on the spectrum?

9 / 9 |
This optical phenomenon contains all the wavelengths of the visible spectrum between 380 and 700 nanometers. It is caused by light entering mist and re-emitted at different angles close to 42 degrees. What eye-catching event happens when this process takes place?