Which of these is not a form of electromagnetic radiation?
a) light from your camp fire
b) ultraviolet causing a suntan
c) dc current from your car battery
d) radio signals
e) x-rays in the doctor's office

Waves are vibration that is transmitted through a medium

The correct option which is not a form of electromagnetic radiation is option C)

C) DC current from your car battery

The reason why option C is correct is presented as follows:

Electromagnetic radiation are a type of waves that is made up of flow of energy in  the form in packets propagating as both electric and magnetic waves that can travel though vacuum (empty space) or through a medium, including radiation and waves such as gamma radiation, visible light and radio waves;

The given options A) light from your camp fire B) Ultraviolet causing suntan, D) Radio signals, and E) X-rays in the doctor's office are electromagnetic waves given that they can propagate through empty space as observed in astronomy

The option C) DC current from your car battery, is not an electromagnetic wave because, it requires a medium, the electric cable to be transmitted, and the current moves in only one direction, making it not an electromagnetic wave

Therefore, the option which is not an electromagnetic wave is option C) DC current from your car battery

Learn more about electromagnetic radiation here:

link

C) DC current from your car battery

Explanation:

Electromagnetic waves are waves consisting of oscillations of electric and magnetic fields perpendicular to each other.

Depending on their wavelength, electromagnetic waves are classified into 7 different types, known as electromagnetic spectrum. These types, from shortest to longest wavelength, are

Gamma rays

X- rays

Ultraviolet

Visible light

Infrared radiation

Microwaves

Radio waves

So, we see that all the following choices

A) light from your camp fire  (visible light)

B) ultraviolet causing a suntan

D) radio signals  (radio waves)

E) X-rays in the doctor's office

Are forms of electromagnetic radiation, while

C) DC current from your car battery

is not a form of electromagnetic radiation, since DC current consists of a flow of electrons.

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !