Yes, there is radiation in lightning.
You can tell because lightning involves a bright
flash of light, and every kind of light is
Scientists say that light is one type of
electromagnetic radiation. It's pretty hard to
explain exactly what the "electromagnetic" part of
that sentence really means, but I just think of
radiation as a more general category for light.
Some other types of radiation are infrared
light, ultraviolet light, microwaves, radio waves
and X-rays. You can't see those types of
radiation because human eyes are only made to see
what we call visible light. But some animals can
see infrared or ultraviolet light, and we can
design machines that can detect different types of
Apart from being invisible to humans, any other
properties of light that I can think of also apply
to other types of radiation. For example, they
travel in straight rays, and they move at the
speed of light. When they hit a surface, they
either pass through it, bounce off, or get
absorbed and turned into heat (usually, they do
some of each). All objects emit radiation, and
objects that are hot emit more radiation.
When I imagine lightning, I think of yellow,
blue or violet light. Lightning contains all these
types of radiation. Lightning also probably
contains invisible types of radiation like
X-rays. I think these are hard to study: as
far as I can tell, scientists still don't know
everything about why lightning would generate the
exact combination of radiation that it does.
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