Question
__ 7. Which is not a type of electromagnetic radiation? a. electrons b. radar waves c. microwaves d. x-rays __ 8. Which statement is incorrect? a. Velocity is the speed of a wave. b. Wavelength is the distance between waves. c. Frequency is the number of wavelengths that pass a given point in a certain amount of time. d. Frequency and wavelength are inversely related. __ 9. Which statement is incorrect? a. X-rays travel at the speed of sound. b. X-rays have no charge. c. X-rays cannot be focused to a point. d. X-rays cause ionization. __ 10. Which statement is correct? a. X-rays are a form of electromagnetic radiation; visible light is not. b. X-rays have more energy than does visible light. c. X-rays have a longer wavelength than does visible light. d. X-rays travel more slowly than does visible light.
Solution
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Answer
__7. **a. electrons** Electrons are subatomic particles with a negative charge and mass. Electromagnetic radiation consists of oscillating electric and magnetic fields and travels as waves.
__8. **a. Velocity is the speed of a wave.** Velocity is a vector quantity that includes both speed and direction. While speed is a component of velocity, it's more accurate to say velocity describes the speed and direction of a wave's propagation. The statement would be more correct if it said, "Speed is the rate at which a wave travels."
__9. **a. X-rays travel at the speed of sound.** X-rays, like all electromagnetic radiation, travel at the speed of light in a vacuum. The speed of sound is significantly slower.
__10. **b. X-rays have more energy than does visible light.** X-rays have a shorter wavelength and higher frequency than visible light, and energy is directly proportional to frequency.
__8. **a. Velocity is the speed of a wave.** Velocity is a vector quantity that includes both speed and direction. While speed is a component of velocity, it's more accurate to say velocity describes the speed and direction of a wave's propagation. The statement would be more correct if it said, "Speed is the rate at which a wave travels."
__9. **a. X-rays travel at the speed of sound.** X-rays, like all electromagnetic radiation, travel at the speed of light in a vacuum. The speed of sound is significantly slower.
__10. **b. X-rays have more energy than does visible light.** X-rays have a shorter wavelength and higher frequency than visible light, and energy is directly proportional to frequency.
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