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Skin Color Survey of Native Peoples In 2000, researchers measured the average amount of UV radiation received in more than fifty regions of the world, and correlated it with the average skin reflectance of people native to those regions (reflectance is a way to measure the amount of melanin pigment in skin: Skin with more melanin is darker, so it reflects less light). Some of the results of this study are shown in F1GURE 14.1 . FIGURE 14.1 Average skin reflectance of people native to ten countries correlated with regional incident UV radiation . Skin reflectance measures how much light of 695-nonometer Wavelength is reflected from skin; UVMED is the annual average UV radiation received at Earth’s surface. Which country receives the most UV radiation?

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 14, Problem 1DAA
Textbook Problem
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Skin Color Survey of Native Peoples In 2000, researchers measured the average amount of UV radiation received in more than fifty regions of the world, and correlated it with the average skin reflectance of people native to those regions (reflectance is a way to measure the amount of melanin pigment in skin: Skin with more melanin is darker, so it reflects less light). Some of the results of this study are shown in F1GURE 14.1.

Chapter 14, Problem 1DAA, Skin Color Survey of Native Peoples In 2000, researchers measured the average amount of UV radiation

FIGURE 14.1 Average skin reflectance of people native to ten countries correlated with regional incident UV radiation. Skin reflectance measures how much light of 695-nonometer Wavelength is reflected from skin; UVMED is the annual average UV radiation received at Earth’s surface.

Which country receives the most UV radiation?

Summary Introduction

To determine: The country that receives the most UV radiation.

Introduction: The reflectance index is a measure of the amount of light energy especially UV radiations absorbed by the body per unit area. The variation of color in human skin shows the amount of melanin synthesized in melanosomes. More melanin pigments provide protection against UV radiations and reflect less light.

Answer to Problem 1DAA

Correct answer: Country K receives the most UV radiations.

Explanation of Solution

As given in the problem statement, researchers in the year 2000 measured the average amount of received UV radiation in more than fifty regions of the world. These data correlated with average skin reflectance of people native to those regions. Skin reflectance is measured as the amount of light at 685nm wavelength is reflected from the skin. It is a way to measure the amount of melanin in skin as more melanin reflects less light. Refer Fig. 14.1, “Average skin reflectance of people native to ten countries correlated with regional incident UV radiation”, in the textbook. It shows skin reflectance in people native to ten countries and UVMED for each country, that is, the amount of annual average UV radiation received at the earth’s surface. As per the data given in the figure, Country K with the highest UVMED (354.21) receives the most UV radiation.

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