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An x-ray with a wavelength of 3.5 × 10^-9 m travels with a speed of 3.0 × 10^8 m/s. What is the frequency of this electromagnetic wave? A.9.52 × 10^-1 Hz B.8.57 × 10^16 Hz C.1.17 × 10^-17 Hz D.1.05 Hz
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An x-ray with a wavelength of 3.5 × 10^-9 m travels with a speed of 3.0 × 10^8 m/s. What is the frequency of this electromagnetic wave? A.9.52 × 10^-1 Hz B.8.57 × 10^16 Hz C.1.17 × 10^-17 Hz D.1.05 Hz

User Lsouza
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\begin{gathered} f=(1)/(T) \\ T=(\lambda)/(v) \end{gathered}
\begin{gathered} T=(3.5\cdot10^(-9)m)/(3\cdot10^8m/s)=1.67\cdot10^(-17)s \\ f=8.57\cdot10^(16)Hz \end{gathered}

Answer. B

User Compcobalt
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