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