chapter 5 - workbook questions
one hertz is
1 cycle per second
one kilohertz is
1,000 cycles per second
if the original exposure rate to a technologist if 8mR/h at a distance of 4 m, moving to a distance of 2 m results in a new exposure rate of:
16 mR/h
light travels at a speed of _____
3 x 10^8 m/s
place the following electromagnetic waves in order of increasing wavelength: 1. visible light, 2. radio waves, 3. gamma rays, 4. infrared
3, 1, 4, 2
place the following electromagnetic waves in order of increasing energy: 1. x-ray, 2. microwaves, 3. visible light, 4. radio
4, 2, 3, 1
using the formula, E=hf, calculate the energy of an x-ray photon if its frequency is 1.26 x Hz
5.2 x 10^4 eV
using the formula, c=f2, calculate the frequency of an x-ray photon that has a wavelength of 2.3x10^-10 m
6.9 x 10^-2 Hz
calculate the original intensity given the following factors: I= 270 mR, d= 40", d^1 = 72", I^1 = ____
875 mR
calculate the new distance given the following factors: I^1 = 26 mR, I^2 = 295 mR, d^1 = 300 cm d^2 = ______
89 cm
using the formula, c=f2, calculate the wavelength of an x-ray photon that has the frequency of 3.28x10^17 Hz
9.15x10^-10 m
which of the following is NOT true regarding electromagnetic radiation? (A) electromagnetic photons have no mass (B) photons have varying frequencies and wavelengths (C) all photons in the electromagnetic spectrum are electrically neutral (D) alpha and beta radiation have wavelengths slightly longer than gamma
D
because the speed of light is consistent, an increase in frequency results in ______ in wavelength:
a decrease
the variations between zero and maximum height of the wave is the _____
amplitude
describe the relationship between frequency, wavelength, and energy
as energy increases, wavelength decreases and frequency increases
if a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach the earth would be the:
both would reach the earth at the same time
based on inverse square law principles, if a technologist is standing 1 m from a radiation source, the intensity she/he will receive if she/he steps back to a distance of 3 m will:
decrease
according to the inverse square law, the intensity of radiation:
decreases with the square of the distance
the number of wave cycles per second is the definition for _____
frequency
ionizing radiation is radiation that:
has enough energy to remove an electron from its orbital shell
the wave-particle duality theory states that:
photons can be characterized as particles or a wave
electromagnetic radiation travels in packets if energy called ____
protons
which of the following electromagnetic waves has the longest wavelength: radio waves, infrared waves, x-rays, ultraviolet waves
radio waves
the lowest energy of visible light is:
red
which of the following devices emits ultraviolet radiation?
tanning beds
hertz is a measure of ____
the number of cycles per second
all electromagnetic waves have what characteristic in common?
they all travel at the speed of light
which of the following is NOT a form of electromagnetic radiation? microwaves, ultrasound, infrared, x-rays
ultrasound
identify the EM radiation below with the highest frequency: visible light, microwaves, generated AC electricity, ultraviolet
ultraviolet
the distance between the same portions of adjacent waves is the _____
wavelength
