a temperature difference and the presence of electromagnetic waves
Explanation:
For radiations to occur, there must be presence of temperature difference and electromagnetic waves.
Radiation is a form of heat transfer that does not require a medium. Any hot body emits radiation from its surface.
A hot body is not at thermal equilibrium with its environment.
It has some of its electrons in excited state and by so they emit radiations.
Electromagnetic waves that vibrates transversely emits radiations. This is the mode of heat transfer in place for most electromagnetic waves
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This is a trick question. Since the planets are in orbit all the time the distance changes, which is because some planets orbit faster than others. I hope this helped at least a little bit.
Answer:
B.
Explanation:
Causes mutations in DNA.
The signature mutation caused by ultraviolet light is a CC to TT mutation, caused when a CC dimer is mispaired with two adenine bases during replication. Because of these mutations, the connection between ultraviolet damage to DNA and cancer is quite clear.
Answer:
See Explanation
Explanation:
According to Newton's second law of motion, the acceleration of a body is proportional to the net external force that acts on the body.
A body accelerated when it is acted upon by an unbalanced net external force.
When the external forces acting on a body are balanced, the effect of each force is cancelled by the other hence the body is not accelerated according to Newton's second law.