Light in Medicine

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What is the relationship between light energy and frequency according to Max Planck's equation?

E = h / f

E = hf (correct)

E = f - h

E = f / h

What happens to the energy of light when its wavelength increases?

It increases

It remains the same

It decreases (correct)

It becomes zero

What is the sum of reflection, refraction, and absorption of light when it strikes a surface?

R + r + A = 1 (correct)

R + r + A = 0

R + r + A = 2

R + r + A = 50%

What is the index of refraction?

The ratio of the speed of light in a vacuum to its speed in a given material Signup and view all the answers

What is unique about the behavior of light?

It behaves both as a wave and as a particle Signup and view all the answers

What happens when a light beam meets a new material at an angle other than perpendicular?

It is refracted Signup and view all the answers

What is the primary source of light in the world?

The sun Signup and view all the answers

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 Signup and view all the answers

What is the primary use of IR light in medicine?

To heat tissues and weld detached retinas Signup and view all the answers

What is the term for the emission of a lower energy light photon when a photon is absorbed?

Fluorescence Signup and view all the answers

What is the result of light being absorbed in a material?

The appearance of heat energy Signup and view all the answers

What is the difference between diffuse and specular reflection?

Diffuse reflection occurs from rough surfaces, while specular reflection occurs from smooth surfaces Signup and view all the answers

What is the term for the scattering of light in many directions?

Diffuse reflection Signup and view all the answers

Where is light reflected at an angle equal to the angle at which it strikes the surface?

Smooth surfaces Signup and view all the answers

What is the condition in which an excess of bilirubin is excreted by the liver into the blood?

Jaundice Signup and view all the answers

What type of light is used to sterilize medical instruments?

Ultraviolet light Signup and view all the answers

What is the result of exposing the skin to UV light from the sun?

Tanning and sunburn Signup and view all the answers

What is the benefit of phototherapy in premature infants?

Reducing bilirubin levels Signup and view all the answers

What is the energy level of ultraviolet photons compared to visible photons?

Higher Signup and view all the answers

What is the result of UV light interacting with the skin?

Both beneficial and harmful reactions Signup and view all the answers

What is the year in which phototherapy was discovered to treat jaundice in premature infants?

1958 Signup and view all the answers

What is the wavelength of light that produces sunburn?

300 nm Signup and view all the answers

What happens to the 300 nm light when it passes through ordinary window glass?

It is absorbed Signup and view all the answers

What is the major cause of skin cancer in humans?

UV light Signup and view all the answers

Where does skin cancer usually appear on the body?

Portions of the body that have received the most sunlight Signup and view all the answers

What percentage of the sun's energy is in the IR region?

About half Signup and view all the answers

What is the main reason we feel warmth from the sun?

IR light Signup and view all the answers

What is the purpose of heat lamps used in physical therapy?

To produce IR light for heating deep tissues Signup and view all the answers

What is a characteristic of IR light compared to visible light?

It penetrates more into tissues Signup and view all the answers