the emission of electrons or other free carriers when light shines on a material.
Melting, as igneous rock is magma or lava that has cooled and hardened.
Answer:10m/s
Explanation:
Wave speed ,v=for
Where π= wavelength=2m
Period =1/f f=frequency of wave
F=1/period
=1/0.2=5Hz
So speed of waves,v=5×2=10m/s
Answer: Symbol is I and unit A
Explanation: A represents Amperes
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