size of a wave rick graziani cabrillo college. rick graziani [email protected] speed of light =...
TRANSCRIPT
Size of a Wave
Rick Graziani
Cabrillo College
Rick Graziani [email protected] 2
Speed of light = 186,000 miles/sec or 300,000,000 meters/sec (approx.)
1 second
186,000 miles
Mile: 0 Mile: 186,000
Speed of Light
Start here End here
1 mile
• 5,280 feet per mile; so 186,000 miles = 982,080,000 feet
• 63,360 inches per mile; so 186,000 miles = 11,784,960,000 inches
Rick Graziani [email protected] 3
Wavelength http://eosweb.larc.nasa.gov/EDDOCS/wavelength.html
• Speed of the wave = Frequency x Wavelength
• Wavelength = Speed of the wave / Frequency
• Wavelength = Speed of the wave / Frequency
• 10.93 feet = 982,080,000 feet / 90,000,000
All About Wavelength
Rick Graziani [email protected] 4
Speed of light = 186,000 miles/sec
Length of rope 186,000 miles long
1 second
Mile: 0, beginning of rope
0 seconds
After 1/2 second
After 1 second
Mile: 186,000, end of rope
• Length of rope 186,000 miles long traveling at the speed of light, 186,000 miles/second
• In 1 second we would see the entire length of rope go by.
0 second
Speed of Light
1 second
Rick Graziani [email protected] 5
Speed of light = 186,000 miles/sec
Length of rope 186,000 miles longMile: 0, beginning of rope
Mile: 186,000, end of rope
• So, if 1 Hz is 1 cycle per second, traveling at the speed of light….
• The length of the wave would be 186,000 miles long (300,000,000 meters).
1 second0 second
Speed of Light – 1 Hz
186,000 miles
Rick Graziani [email protected] 6
Length of rope 186,000 miles longMile: 0, beginning of rope
Mile: 186,000, end of rope
• 2 Hz is 2 cycles per second, traveling at the speed of light….
• The length of each wave would be 186,000/2 or 93,000 miles long (150,000,000 meters).
1 second0 second
Speed of Light – 2 Hz
93,000 miles
Speed of light = 186,000 miles/sec
Rick Graziani [email protected] 7
• 11,784,960,000 inches in a mile
• 1 Hz wave = 11,784,960,000 inches (11 billion inches)
• 2 Hz wave = 11,784,960,000 / 2 = 6 billion inches (give or take)
• What would a wave the size of 11 GHz wave be?
Speed of Light – Let’s do inches
11,784,960,000 inches
6,000,000,000 inches
Rick Graziani [email protected] 8
• What would a wave the size of 11 GHz wave be?
• Size of the rope divided by the number of pieces = size of each piece
• About 1 inch! (11,784,960,000 inches / 11,000,000,000 pieces or cycles or Hz)
• Same as slicing up the 186,000 mile rope into 11 billion equal pieces.
• Each piece is 1 inch, 11 billion pieces equal 11 billion inches, the size of our rope traveling at 186,000 miles per second.
Speed of Light – Lets do inches
1 second0 second …1 2 11 billion
Length of rope 186,000 miles longMile: 0, beginning of rope
Mile: 186,000, end of rope
1 inch
Length of rope 11.8 billion inches long
Rick Graziani [email protected] 9
• What would a wave the size of 1 GHz wave be?
• 11 inches! (Actually, 11.8 inches because we rounded off values.)
(approx.: 11,784,960,000 inches / 1,000,000,000)
• Same as slicing up the 186,000 mile rope into 1 billion equal pieces.
• Each piece is 11 inches, 1 billion pieces equal 11 billion inches, the size of our rope traveling at 186,000 miles per second.
Speed of Light – Lets do inches
1 second0 second …1 2 1 billion
Length of rope 186,000 miles longMile: 0, beginning of rope
Mile: 186,000, end of rope
11.8 inches
Length of rope 11.8 billion inches long
Rick Graziani [email protected] 10
RADM Grace Hopper
• Grace Hopper, “Mother of Cobol”
• The size of a nanosecond, 11.8 inches
• The distance the speed of light travels in a billionth of a second.
Rick Graziani [email protected] 11
• Same as slicing up the 186,000 mile rope into 2.4 billion equal pieces.
• Each piece is 4.8 inches or 12 cm (.12 meters)
(approx.: 11,784,960,000 inches / 2,400,000,000)
• 2.4 billion pieces equal 11 billion inches, the size of our rope traveling at 186,000 miles per second.
Size of a 2.4 GHz WLAN wave
1 second0 second …1 2 2.4 billion
Length of rope 186,000 miles longMile: 0, beginning of rope
Mile: 186,000, end of rope
4.8 inches
Length of rope 11.8 billion inches long
Rick Graziani [email protected] 12
• Same as slicing up the 186,000 mile rope into 5.8 billion equal pieces.
• Each piece is 2 inches or 5 cm (.05 meters)
(approx.: 11,784,960,000 inches / 5,800,000,000)
• 5.8 billion pieces equal 11 billion inches, the size of our rope traveling at 186,000 miles per second.
Size of a 5.8 GHz WLAN wave
1 second0 second …1 2 5.8 billion
Length of rope 186,000 miles longMile: 0, beginning of rope
Mile: 186,000, end of rope
2 inches
Length of rope 11.8 billion inches long
End of Size of a Wave
Rick Graziani
Cabrillo College