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Optics and Electromagnetic Waves
Optics and Electromagnetic Waves
Electromagnetic Waves
Visible light is a small part of all electromagnetic waves.
Electromagnetic waves result from vibrations between electric and magnetic fields.
They don't require a medium and can travel through space.
Speed in a vacuum: 300,000,000 m/s.
Types of Electromagnetic Waves
Radio:
Use: AM/FM radio, TV signals, cellphones, radar, astronomy
Wavelength: > 1 cm
Infrared (IR, heat):
Use: Remote controls, heat detection, physical therapy (heating)
Wavelength: 700 nm – 0.05 cm
Visible:
Use: Human vision
Wavelength: 400 – 700 nm
Ultraviolet (UV):
Use: Tanning/burning skin, sterilization, increases skin cancer risk
Wavelength: 10 – 400 nm
X-rays and gamma rays:
Use: Medical imaging, cancer treatment, security equipment
Wavelength: < 10 nm
Scientific Notation
Used for very large or small numbers.
Two parts:
A number between 1 and 10.
A power of ten.
Steps to convert to scientific notation:
Place a decimal after the first non-zero digit (from the left).
Multiply by the appropriate power of ten (based on how many places the decimal moved).
Moving the decimal to the left results in a positive exponent.
Moving the decimal to the right results in a negative exponent.
Examples
465 = 4.65 × 10^2
0.0032 = 3.2 × 10^{-3}
Practice
3400 = 3.4 × 10^3
35,500 = 3.55 × 10^4
0.015 = 1.5 × 10^{-2}
0.00075 = 7.5 × 10^{-4}
2,000,000 = 2.0 × 10^6
0.001 005 = 1.005 × 10^{-3}
0.000019 = 1.9 × 10^{-5}
69 = 6.9 × 10^1
21,000 = 2.1 × 10^4
654,000 = 6.54 × 10^5
0.147 = 1.47 × 10^{-1}
0.085 = 8.5 × 10^{-2}
1.23 = 1.23 × 10^0
580 = 5.80 × 10^2
0.000 15 = 1.5 × 10^{-4}
0.000 104 = 1.04 × 10^{-4}
100.2 = 1.002 × 10^2
65,300 = 6.53 × 10^4
0.000 000 000 3 = 3.0 × 10^{-10}
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Chapter 17: Clinical Psychology: Treatment
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Studied by 46 people
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Chapter 23: The Great Depression
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Studied by 137 people
5.0
(1)
Chapter One: What Is Social Psychology
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Studied by 35 people
5.0
(2)
AP Precalculus Ultimate Guide (copy)
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Studied by 116 people
5.0
(1)
Chapter 6: Settling of the Western Hemisphere (1491-1607)
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Studied by 65 people
5.0
(1)
59. Nhập vào một danh sách số nguyên L, tính giá trị trung bình của danh sách L
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Studied by 1 person
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