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An ultraviolet wave traveling through a vacuum has a wavelength of 4.0 x 10-7 m. The wave's frequency, written in
scientific notation to two significant figures, is ( blank )
x 1014 Hz.

Correct Wave's frequency f = 7.5 · 10¹⁴ Hz

Explanation:

Given:  wavelength λ = 4.0 · 10⁻⁷ m and

ultraviolet wave's  speed V = 3 · 10⁸ m/s

The formula for calculating frequency is:

f = V / λ = 3 · 10⁸ / 4.0 · 10⁻⁷ = 0.75 · 10¹⁵ = 7.5 · 10¹⁴ Hz

f = 7.5 · 10¹⁴ Hz

God is with you!!!

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explanation:

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.