Martin Gardner, Physics Trick of the Month: Blacker than Black, TPT 31, 94 (1993).
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P2-21. Black Body Model
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- Sections
- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
- K. Electromagnetic Principles
- L. Geometrical Optics
- M. Wave Optics
- N. Spectra & Color
- O. Vision
- P. Modern Physics
P2-21. Black Body Model
Purpose
Demonstrate that a cavity is blacker than any substance, and as such is a good approximation to an ideal black body.
Equipment
Box with hole and two black spots.
Images
Description
A hole cut in a box which is black inside is flanked by two similar size patches of black paper and black felt.The hole appears darker than the two black surfaces, even when the surfaces are clean.
References
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See pagesa. general materials & mathematics
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See pagesA1. Basic Materials & Measurements
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See pagesA2. Mathematics
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See pagesb. statics
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See pagesB1. Center Of Mass Statics
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See pagesB2. Equilibrium Of Forces & Torques
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See pagesB3. Simple Machines
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See pagesB4. Elasticity
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See pagesc. kinematics & dynamics
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See pagesC1. Center Of Mass Motion
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See pagesC3. First Law Of Motion
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See pagesC4. Second Law Of Motion
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See pagesC5. Third Law Of Motion
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See pagesC6. Friction
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See pagesC7. Collisions
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See pagesC8. Mechanical Energy & Power
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See pagesd. rotational mechanics
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See pagesD1. Rotational Kinematics & Dynamics
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See pagesD2. Moment Of Intertia
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See pagesD3. Angular Momentum
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See pagesD4. Gyroscopes
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See pagesD5. Rotational Esoterica
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See pagese. gravitation & astronomy
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See pagesE1. Gravitation & Orbits
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See pagesE2. Astronomy
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See pagesf. fluid mechanics
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See pagesF1. Pressure In Static Fluids
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See pagesF2. Buoyancy
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See pagesF3. Surface Tension
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See pagesF4. Fluid In Motion
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See pagesF5. Pressure In Moving Fluids
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See pagesg. vibrations & mechanical waves
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See pagesG1. Simple Harmonic Motion
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See pagesG2. Resonance & Coupled Oscillations
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See pagesG3. Mechanical Waves One Dimensional
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See pagesG4. Mechanical Waves Two Dimensional
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See pagesh. sound
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See pagesH1. Nature Of Sound
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See pagesH2. Wave Properties Of Sound
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See pagesH3. Standing Sound Waves
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See pagesH4. Music
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See pagesH5. The Ear
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See pagesH6. The Voice
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See pagesi. thermodynamics
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See pagesI1. Thermal Properties Of Matter
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See pagesI2. Transfer Of Heat
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See pagesI3. Gases
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See pagesI4. Changes Of State
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See pagesI5. Laws Of Thermodynamics
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See pagesj. electrostatics & magnetostatics
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See pagesJ1. Electrostatic Charge & Force
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See pagesJ3. Electric Fields & Potential
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See pagesJ4. Capacitance & Polarization
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See pagesJ5. Magnetostatics
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See pagesJ6. Electromagnets
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See pagesJ7. Magnetic Materials
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See pagesk. electromagnetic principles
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See pagesK1. Forces On Moving Charges
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See pagesK2. Electromagnetic Induction
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See pagesK3. Transformers
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See pagesK4. Motors & Generators
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See pagesK5. Electrical Properties Of Matter
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See pagesK6. Electric Circuits & Instruments
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See pagesK7. Rlc Circuits
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See pagesK8. Electromagnetic Waves
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See pagesl. geometrical optics
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See pagesL1. Light Sources & Light Rays
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See pagesL2. Plane Mirrors
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See pagesL3. Curved Mirrors
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See pagesL4. Refraction
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See pagesL5. Total Internal Reflection
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See pagesL6. Lenses
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See pagesL7. Optical Instruments
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See pagesm. wave optics
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See pagesM2. Diffraction Circular
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See pagesM3. Interferometers
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See pagesM4. Thin Film Interference
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See pagesM6. Holograms
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See pagesM7. Polarization & Scattering
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See pagesM8. Optical Activity & Birefringence
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See pagesM9. Elliptical Polarization
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See pagesn. spectra & color
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See pagesN1. Continuous Spectra
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See pagesN2. Line Spectra
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See pagesN3. Color
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See pageso. vision
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See pagesO2. Visual Latency
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See pagesO4. Optical Illusions
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See pagesp. modern physics
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See pagesP1. Relativity
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See pagesP2. Quantum Mechanics
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See pagesP3. Atoms & Molecules
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See pagesP4. Nuclei & Particles
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See pagesa. general materials & mathematics
-
See pagesA1. Basic Materials & Measurements
-
See pagesA2. Mathematics
-
-
See pagesb. statics
-
See pagesB1. Center Of Mass Statics
-
See pagesB2. Equilibrium Of Forces & Torques
-
See pagesB3. Simple Machines
-
See pagesB4. Elasticity
-
-
See pagesc. kinematics & dynamics
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See pagesC1. Center Of Mass Motion
-
-
See pagesC3. First Law Of Motion
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See pagesC4. Second Law Of Motion
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See pagesC5. Third Law Of Motion
-
See pagesC6. Friction
-
See pagesC7. Collisions
-
See pagesC8. Mechanical Energy & Power
-
See pagesd. rotational mechanics
-
See pagesD1. Rotational Kinematics & Dynamics
-
See pagesD2. Moment Of Intertia
-
See pagesD3. Angular Momentum
-
See pagesD4. Gyroscopes
-
See pagesD5. Rotational Esoterica
-
-
See pagese. gravitation & astronomy
-
See pagesE1. Gravitation & Orbits
-
See pagesE2. Astronomy
-
-
See pagesf. fluid mechanics
-
See pagesF1. Pressure In Static Fluids
-
See pagesF2. Buoyancy
-
See pagesF3. Surface Tension
-
See pagesF4. Fluid In Motion
-
See pagesF5. Pressure In Moving Fluids
-
-
See pagesg. vibrations & mechanical waves
-
See pagesG1. Simple Harmonic Motion
-
See pagesG2. Resonance & Coupled Oscillations
-
See pagesG3. Mechanical Waves One Dimensional
-
See pagesG4. Mechanical Waves Two Dimensional
-
-
See pagesh. sound
-
See pagesH1. Nature Of Sound
-
See pagesH2. Wave Properties Of Sound
-
See pagesH3. Standing Sound Waves
-
See pagesH4. Music
-
See pagesH5. The Ear
-
See pagesH6. The Voice
-
-
See pagesi. thermodynamics
-
See pagesI1. Thermal Properties Of Matter
-
See pagesI2. Transfer Of Heat
-
See pagesI3. Gases
-
See pagesI4. Changes Of State
-
See pagesI5. Laws Of Thermodynamics
-
-
-
See pagesj. electrostatics & magnetostatics
-
See pagesJ1. Electrostatic Charge & Force
-
-
See pagesJ3. Electric Fields & Potential
-
See pagesJ4. Capacitance & Polarization
-
See pagesJ5. Magnetostatics
-
See pagesJ6. Electromagnets
-
See pagesJ7. Magnetic Materials
-
-
See pagesk. electromagnetic principles
-
See pagesK1. Forces On Moving Charges
-
See pagesK2. Electromagnetic Induction
-
See pagesK3. Transformers
-
See pagesK4. Motors & Generators
-
See pagesK5. Electrical Properties Of Matter
-
See pagesK6. Electric Circuits & Instruments
-
See pagesK7. Rlc Circuits
-
See pagesK8. Electromagnetic Waves
-
-
See pagesl. geometrical optics
-
See pagesL1. Light Sources & Light Rays
-
See pagesL2. Plane Mirrors
-
See pagesL3. Curved Mirrors
-
See pagesL4. Refraction
-
See pagesL5. Total Internal Reflection
-
See pagesL6. Lenses
-
See pagesL7. Optical Instruments
-
-
See pagesm. wave optics
-
-
See pagesM2. Diffraction Circular
-
See pagesM3. Interferometers
-
See pagesM4. Thin Film Interference
-
-
See pagesM6. Holograms
-
See pagesM7. Polarization & Scattering
-
See pagesM8. Optical Activity & Birefringence
-
See pagesM9. Elliptical Polarization
-
-
See pagesn. spectra & color
-
See pagesN1. Continuous Spectra
-
See pagesN2. Line Spectra
-
See pagesN3. Color
-
-
See pageso. vision
-
See pagesO2. Visual Latency
-
See pagesO4. Optical Illusions
-
-
See pagesp. modern physics
-
See pagesP1. Relativity
-
See pagesP2. Quantum Mechanics
-
See pagesP3. Atoms & Molecules
-
See pagesP4. Nuclei & Particles
-
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