How long does a pendulum have to be to have a period of 1 second?

Answer: A simple pendulum with a period of 1 second will have a length of 0.25 meters or 25 centimeters.

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Moreover, who created the pendulum?

Christiaan Huygens Pendulum clock / Inventor. Such was the case with 17th century Dutch astronomer Christiaan Huygens. He became the first to report the phenomenon of coupled oscillation in two pendulum clocks (which he invented) in his bedroom while recovering from an illness in 1665. Do pendulums count as spells in the grave? While in a Pendulum Zone, a Pendulum Monster is treated as a Spell and not as a monster. If a Pendulum Monster would be sent from the field to the Graveyard (either as a Monster Card or Spell Card, and even if it is face-down), it is placed face-up in the Extra Deck instead.

Regarding this, do pendulums count as spells?

No, activating a Pendulum Effect is activating a Spell *Effect*, not a Spell card. However, placing a Pendulum Scale in its zone is activating a Spell Card and count to give Spell Counters to those appropriate. People also ask can you pendulum summon normal monsters? Pendulum Monster Cards can be Summoned like regular monsters in your Monster Zones, or activated as Spell Cards in your Pendulum Zones. You can declare a Pendulum Summon once per turn during one of your Main Phases, much like how you can Normal Summon or Set a monster once per turn during one of your Main Phases.

What happens if you Tribute a pendulum monster?

"When a Pendulum Monster (even if it is face-down) would be sent from the field to the Graveyard, either as a Monster Card or Spell Card, it is placed face-up in the Extra Deck Zone instead.