40 Questions
What is the relationship between light energy and frequency according to Max Planck's equation?
E = hf
What happens to the energy of light when its wavelength increases?
It decreases
What is the sum of reflection, refraction, and absorption of light when it strikes a surface?
R + r + A = 1
What is the index of refraction?
The ratio of the speed of light in a vacuum to its speed in a given material
What is unique about the behavior of light?
It behaves both as a wave and as a particle
What happens when a light beam meets a new material at an angle other than perpendicular?
It is refracted
What is the primary source of light in the world?
The sun
What is the result of a light photon being absorbed in a sensitive cell of the retina?
A chemical change in the molecule that triggers an electrical signal
What is the primary use of IR light in medicine?
To heat tissues and weld detached retinas
What is the term for the emission of a lower energy light photon when a photon is absorbed?
Fluorescence
What is the result of light being absorbed in a material?
The appearance of heat energy
What is the difference between diffuse and specular reflection?
Diffuse reflection occurs from rough surfaces, while specular reflection occurs from smooth surfaces
What is the term for the scattering of light in many directions?
Diffuse reflection
Where is light reflected at an angle equal to the angle at which it strikes the surface?
Smooth surfaces
What is the condition in which an excess of bilirubin is excreted by the liver into the blood?
Jaundice
What type of light is used to sterilize medical instruments?
Ultraviolet light
What is the result of exposing the skin to UV light from the sun?
Tanning and sunburn
What is the benefit of phototherapy in premature infants?
Reducing bilirubin levels
What is the energy level of ultraviolet photons compared to visible photons?
Higher
What is the result of UV light interacting with the skin?
Both beneficial and harmful reactions
What is the year in which phototherapy was discovered to treat jaundice in premature infants?
1958
What is the wavelength of light that produces sunburn?
300 nm
What happens to the 300 nm light when it passes through ordinary window glass?
It is absorbed
What is the major cause of skin cancer in humans?
UV light
Where does skin cancer usually appear on the body?
Portions of the body that have received the most sunlight
What percentage of the sun's energy is in the IR region?
About half
What is the main reason we feel warmth from the sun?
IR light
What is the purpose of heat lamps used in physical therapy?
To produce IR light for heating deep tissues
What is a characteristic of IR light compared to visible light?
It penetrates more into tissues
What is the wavelength range of IR light used in heat lamps?
1000 to 2000 nm
UV light with a wavelength of 300 nm can pass through ordinary window glass.
False
Skin cancer is most common on parts of the body that receive little sunlight.
False
IR light is better able to heat deep tissues than visible light.
True
The majority of the sun's energy is in the visible spectrum.
False
The warmth we feel from the sun is mainly due to UV light.
False
UV light is the primary cause of skin cancer in humans.
True
Heat lamps are used to treat skin conditions.
True
UV light with wavelengths of 1000 to 2000 nm is used in heat lamps.
False
The sun's energy is primarily composed of visible light.
False
The DNA in cells is able to absorb visible light.
False
Test your understanding of light in medicine, including its wave-particle duality, energy-frequency relationship, and equations governing its behavior. Explore the concepts introduced by Max Planck and their applications in medicine.
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