Test 2 Physics-Electromagnetic Energy

photons (particles)

Electromagnetic energy travels in ____

Photon

smallest unit of EME, continuously changing electric and magnetic fields

qualities of a photon

no mass, electrically neutral, travel in straight lines, travel at a constant velocity, travel in a vacuum.

inversley

frequency and wavelength are ___ related

directly

frequency and energy are ____ related

inversely

energy and wavelength are _____ related

Velocity, Frequency, amplitude, wavelength

properties of electromagnetic energy

velocity

speed of a photon as it travels through a medium

3×10^8 m/s

what is the speed of light

Amplitude

one-half the range from crest to valley over which the sine wave varies, height of wave, force of wave, rise and fall

constant

photon velocity is ____

wavelength

distance between corresponding points on a sine wave; lambda

Frequency

number of wavelengths per given unit of time

velocity= frequency x wavelength

wave/ energy equation

energy

function of a photon and uses velocity, frequency, and wavelength

meters

what is wavelength measured in

hertz

what is frequency measured in

electron volts

what is energy measured in

radiofrequency, visible light, xrays/gamma rays

what are the 3 regions of the EM spectrum that are important to radiologic science

visible light

what is the only are of the spectrum that humas can detect with their senses

ultraviolet, x-ray, gamma rays

ionizing on electromagnetic spectrum

refraction

deviation in direction of travel when passing from one transparent medium to another (water)

radiofrequency

long wavelength, low frequency, low energy

not ionizing

is radiofrequency ionizing or not ionizing

nucleus

where is the energy origin for gamma rays

orbital shells

where is the energy origin for x rays

short, high, high

x rays and gamma rays have a _____ wavelength, ____ frequency, and ______ energy

ionizing radiation

interact with matter as though they are particles, capable of causing ionization in matter

waves

in air x-rays and gamma rays travel as ____

paticles

in the body x-rays and gamma rays travel as_______

wave-particle duality

Electromagnetic energy will act like both waves and

particles. The degree of duality is dependent on

wavelength, frequency, and energy of a photon

waves

visible light acts more like __

photons

x-rays act more like _____

Einstein’s relativity equation and Planck’s Quantum

Equation.

what two things can prove the wave-particle duality

radiolucent

allow x-rays to pass

radiopaque

absorption of x-rays

intensity

number of photons

radiation intensity

is inversely related to the square of the distance (d) from the source.

• I1/I2 =(d2/d1)2

E=mc²

equation meaning mass can be converted to energy and energy can be converted to mass