Answer:
Scandium with an ion charge of +3
Explanation:
Answer:
The focal length of the given spherical mirror is 20cm.
Explanation:
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Answer:
87.5 m/s
Explanation:
The speed of a wave is given by

where
v is the wave speed
is the wavelength
f is the frequency
In this problem, we have
is the frequency
is the wavelength
Substituting into the equation, we find

Solar energy - A
nuclear energy - B
fossil fuel energy - C
wind energy - D
geothermal energy - E