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3. X-rays are produced by bombarding a metal surface with a beam of energetic electrons. If copper is the metal used, the wavelength of the

3. X-rays are produced by bombarding a metal surface with a beam of energetic electrons. If copper is the metal used, the wavelength of the X-radiation is 0.154 nm. Calculate the frequency of this radiation.

4. A student uses a microwave oven to heat a meal. The wavelength of the radiation is 1.20 cm. What is the energy one photon of this microwave radiation?

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