Multiple Choice
Which sequence shows all the colors of visible light arranged from shortest to longest wavelength?
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9. Quantum Mechanics
Electromagnetic Spectrum
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Which type of rays from the sun are primarily responsible for causing sunburns and tanning, and are also referred to as 'burning rays'?
A
Infrared rays
B
Ultraviolet A (UVA) rays
C
Visible light rays
D
Ultraviolet B (UVB) rays
Verified step by step guidance1
Understand that the sun emits different types of rays, including infrared, visible light, and ultraviolet (UV) rays, each with different energy levels and effects on the skin.
Recall that ultraviolet rays are divided into three categories based on wavelength: UVA, UVB, and UVC, with UVC being mostly absorbed by the Earth's atmosphere and not reaching the surface.
Identify that UVA rays penetrate deeper into the skin and are primarily responsible for aging effects, while UVB rays have higher energy and primarily affect the outer skin layers, causing sunburns and tanning.
Recognize that UVB rays are often called 'burning rays' because they cause the skin damage that leads to sunburn and stimulate melanin production, which results in tanning.
Conclude that among the options given, Ultraviolet B (UVB) rays are the rays from the sun primarily responsible for causing sunburns and tanning.
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