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Sunburn effect (as measured by the UV index) is the product of the sunlight power spectrum (radiation intensity) and the erythemal action spectrum (skin sensitivity) across the range of UV wavelengths. [9] [10] The UV index is a number linearly related to the intensity of sunburn-producing UV radiation at a given point on the Earth's surface.
Highest ultraviolet index measured: On 29 December 2003, a UV index of 43.3 was detected at Chile/Bolivia's Licancabur volcano, at 19,423 feet (5,920 m) altitude. A light-skinned individual in such conditions may experience moderate sunburn in as little as 4 minutes.
[16] [20] On average, dew points range from 31 °F (−1 °C) in April to 58 °F (14 °C) in August. [21] Occasionally, dew points can drop as low as 0 °F (−18 °C), or they can exceed 70 °F (21 °C) during periods of strong monsoon activity—creating muggy conditions in the area. [22] [16] [23] Fire-damaged saguaro cactus near Phoenix
Here's how average highs rise from Feb. 1 to mid-May: Atlanta: 55 degrees on Feb. 1 → 66 degrees on March 15 → 74 degrees on April 15 → 81 degrees on May 15 Dallas-Fort Worth: 59 degrees on ...
In reflected UV photography the subject is illuminated directly by UV emitting lamps (radiation sources) or by strong sunlight. A UV transmitting filter is placed on the lens, which allows ultraviolet radiation to pass and which absorbs or blocks all light and infrared radiation. UV filters are made from special colored glass and may be coated ...
UV light allows them to broadcast a guide to where their pollen is located. [4] ... This page was last edited on 9 April 2024, at 00:23 (UTC).
The mission of ICNIRP is to screen and evaluate scientific knowledge and recent findings toward providing protection guidance on non-ionizing radiation, i.e. radio, microwave, UV and infrared. The commission produces reviews of the current scientific knowledge and guidelines summarizing its evaluation.
The William L. Davis Stock Index From July 2011 to December 2012, if you bought shares in companies when William L. Davis joined the board, and sold them when he left, you would have a 49.3 percent return on your investment, compared to a 6.5 percent return from the S&P 500.