Background for radioactivity
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radioactivity

/ˌreɪdioʊækˈtɪvɪti/ /ˌreɪdiːoʊækˈtɪvɪti/

Meanings
noun
Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.

Examples :

"The old watch contained radium, which caused its hands to glow in the dark due to radioactivity. "
physics energy substance chemistry environment science material

Related Words

Illustration including

including verb

/ɪnˈkluːdɪŋ/

To bring into a group, class, set, or total as a (new) part or member.

"I will purchase the vacation package if you will include car rental."

Illustration emission

emission noun

/ɪˈmɪʃn̩/

Something which is emitted or sent out; issue.

"the emission was mostly blood"

Illustration ionizing

ionizing verb

/ˈaɪəˌnaɪzɪŋ/

To dissociate atoms or molecules into electrically charged species; to be thus dissociated.

""The radiation from the X-ray machine is strong enough to be ionizing the atoms in your body." "

Illustration breakdown

breakdown noun

/ˈbɹeɪkdaʊn/

A failure, particularly mechanical; something that has failed

"We saw a breakdown by the side of the road."

Illustration particles

particles noun

/ˈpɑːtɪkl̩z/ /ˈpɑɹtɪkl̩z/

A very small piece of matter, a fragment; especially, the smallest possible part of something.

"Dust particles floated in the sunbeam coming through the window. "

Illustration positrons

positrons noun

/ˈpɑzɪˌtrɑnz/ /ˈpɒzɪˌtrɒnz/

The antimatter equivalent of an electron, having the same mass but a positive charge

"The notion of a positron weapon remains the stuff of science fiction."

Illustration contained

contained verb

/kənˈteɪnd/

To hold inside.

"The box contained old photographs. "

Illustration electrons

electrons noun

/ɪˈlɛktrɑnz/ /iˈlɛktrɑnz/

The subatomic particle having a negative charge and orbiting the nucleus; the flow of electrons in a conductor constitutes electricity.

"Simple sentence: "The light bulb works because electrons flow through the wire, creating electricity." "

Illustration spontaneous

spontaneous adjective

/spɒnˈteɪ.ni.əs/ /spɑnˈteɪ.ni.əs/

Self-generated; happening without any apparent external cause.

"He made a spontaneous offer of help."

Illustration radiation

radiation noun

/ɹaɪ.di.ˈaɪ.ʃən/

The shooting forth of anything from a point or surface, like diverging rays of light.

"heat radiation"

Illustration consequence

consequence noun

/ˈkɒnsɪkwɛns/ /ˈkɑnsɪkwəns/

That which follows something on which it depends; that which is produced by a cause.

"If you miss your curfew, a consequence is having to stay inside and do chores. "

Illustration dangerous

dangerous adjective

/ˈdeɪnd͡ʒ(ə)ɹəs/ /ˈdeɪnd͡ʒəɹəs/

Full of danger.

"Railway crossings without gates are highly dangerous."