1 Decametre - Human-defined Scales and Structures

Human-defined Scales and Structures

• 10 metres — wavelength of the highest shortwave radio frequency, 30 MHz
• 23 metres — height of the obelisk of the Place de la Concorde, Paris, France.
• 25 metres — wavelength of the broadcast radio shortwave band at 12 MHz
• 29 metres — height of the lighthouse at Savudrija, Slovenia.
• 31 metres — wavelength of the broadcast radio shortwave band at 9.7 MHz
• 34 metres — height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia.
• 40 metres — average depth beneath the seabed of the Channel tunnel
• 49 metres — wavelength of the broadcast radio shortwave band at 6.1 MHz
• 55 metres — height of the Leaning Tower of Pisa
• 60 metres — height of Pyramid of Djoser
• 64 metres — wingspan of a Boeing 747-400
• 70 metres — length of the Bayeux Tapestry
• 70 metres — width of a typical football field
• 88.40 metres — wingspan of the Antonov An-225 transport aircraft
• 100 metres — wavelength of the lowest shortwave radio frequency, 3 MHz