18 Questions
How is ultraviolet radiation classified based on the interaction with biological materials?
UVA, UVB, UVC
What forms the ozone layer in the lower stratosphere?
Oxygen
Which division of ultraviolet radiation is responsible for its best-known effects on organisms?
UVB
How is ultraviolet radiation produced by high-temperature surfaces like the Sun?
As a continuous spectrum
Which region of ultraviolet radiation does not reach Earth's surface?
UVC
How does ultraviolet radiation interact with certain materials to cause fluorescence?
By emitting visible light
What is the primary mechanism by which ultraviolet radiation causes skin cancer?
Ultraviolet radiation causes direct damage to the DNA of skin cells, leading to mutations that can cause cancer.
Which of the following is NOT a positive effect of ultraviolet radiation on the human body?
Causing the skin to become thicker and more wrinkled, which can protect against skin cancer
What is the primary purpose of using ultraviolet radiation in fluorescent lamps?
To interact with phosphors that emit visible light
What is the typical wavelength range of infrared radiation?
700 nanometers to 1 millimeter
What is the primary source of thermal radiation emitted by objects near room temperature?
Infrared radiation
Which of the following is a unique property of infrared radiation compared to other types of electromagnetic radiation?
It is undetectable by the human eye.
Which of the following is the primary reason for the increased hazardous effects of UVB radiation on organisms when the ozone layer becomes thin?
UVB radiation reaches the Earth's surface in higher amounts
What is the primary mechanism by which melanin helps protect the skin from the harmful effects of ultraviolet radiation?
Melanin absorbs ultraviolet radiation and limits its penetration into tissues
Which of the following is the most direct consequence of severe ultraviolet sunburns on the human body?
Blisters, swelling, seepage of fluid, and sloughing of the outer skin
What is the primary reason why persons of light complexion experience the harmful effects of ultraviolet radiation to a greater degree?
They have less melanin pigment in their skin
What is the primary function of the blood capillaries in the skin when it is exposed to ultraviolet radiation?
To dilate and aggregate red and white blood cells
What is the primary purpose of the tanning response in the skin when exposed to ultraviolet radiation?
To activate melanin pigments and migrate them to the surface of the skin
Explore the characteristics of ultraviolet radiation, its position in the electromagnetic spectrum, and its effects on materials. Learn about the range of wavelengths and how ultraviolet radiation is detected.
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