Learn on PengiAmplify Science (California) Grade 8Chapter 2: Light as a Wave

Lesson 4: Explaining the Cancer Rate

Key Idea.

Section 1

The Mismatch Mechanism

Key Idea

Skin cancer risk is determined by a ratio between two factors: Incoming Energy (UV intensity from the sun) and Absorption Capacity (Melanin in the skin).

In Australia, the incoming UV energy is very high. If the population living there has naturally low melanin levels, their absorption capacity is overwhelmed. This mismatch implies that the natural shield is not strong enough to handle the environment's energy level.

Section 2

The DNA Damage Pathway

Key Idea

What happens to the energy that isn't stopped by melanin?

It continues traveling until it hits the DNA inside the cell nucleus.

Book overview

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Chapter 2: Light as a Wave

  1. Lesson 1

    Lesson 1: Types of Light

  2. Lesson 2

    Lesson 2: Wavelength and the Spectrum

  3. Lesson 3

    Lesson 3: Selective Absorption and Melanin

  4. Lesson 4Current

    Lesson 4: Explaining the Cancer Rate

Lesson overview

Expand to review the lesson summary and core properties.

Expand

Section 1

The Mismatch Mechanism

Key Idea

Skin cancer risk is determined by a ratio between two factors: Incoming Energy (UV intensity from the sun) and Absorption Capacity (Melanin in the skin).

In Australia, the incoming UV energy is very high. If the population living there has naturally low melanin levels, their absorption capacity is overwhelmed. This mismatch implies that the natural shield is not strong enough to handle the environment's energy level.

Section 2

The DNA Damage Pathway

Key Idea

What happens to the energy that isn't stopped by melanin?

It continues traveling until it hits the DNA inside the cell nucleus.

Book overview

Jump across lessons in the current chapter without opening the full course modal.

Continue this chapter

Chapter 2: Light as a Wave

  1. Lesson 1

    Lesson 1: Types of Light

  2. Lesson 2

    Lesson 2: Wavelength and the Spectrum

  3. Lesson 3

    Lesson 3: Selective Absorption and Melanin

  4. Lesson 4Current

    Lesson 4: Explaining the Cancer Rate