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Transmissivity Formula:
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Transmissivity (τ) is the fraction of incident radiation flux transmitted through a material or body. It represents the portion of radiation that passes through without being absorbed or reflected.
The calculator uses the transmissivity formula:
Where:
Explanation: The formula calculates transmissivity by subtracting both absorptivity and reflectivity from 1, as these three properties must sum to unity for conservation of energy.
Details: Calculating transmissivity is crucial in various fields including optics, thermal engineering, and materials science. It helps determine how much radiation passes through materials, which is essential for designing optical systems, solar panels, and energy-efficient buildings.
Tips: Enter absorptivity and reflectivity values between 0 and 1. Both values must be valid and their sum should not exceed 1 for physically meaningful results.
Q1: What are the typical ranges for absorptivity, reflectivity, and transmissivity?
A: All three properties range from 0 to 1, and they must sum to 1 for any given material and wavelength.
Q2: Can transmissivity be negative?
A: No, transmissivity cannot be negative. If the sum of absorptivity and reflectivity exceeds 1, the result is not physically meaningful.
Q3: How does wavelength affect these properties?
A: Absorptivity, reflectivity, and transmissivity are wavelength-dependent. A material may transmit certain wavelengths while absorbing or reflecting others.
Q4: What materials have high transmissivity?
A: Materials like glass, certain plastics, and optical crystals typically have high transmissivity in specific wavelength ranges.
Q5: How is this calculation used in real-world applications?
A: This calculation is used in designing optical filters, solar energy systems, greenhouse materials, and various optical instruments where radiation transmission is critical.