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1. An electromagnetic wave in a vacuum has a wavelength of 0.07 m. What is its frequency? (1 point) f = 3.0 • 108 m/s f = 4.3 • 109 Hz f = 3.0 • 109 Hz f = 4.3 • 108 m/s 2. Which of the following occurs as light travels farther from its source? (1 point) Far from the source, photons come together in a small area. The intensity of light increases as photons move away from the source. The source gives off less light as photons move away from it. Far from the source, photons spread over a larger area. 3. Infrared rays have a shorter wavelength than (1 point) ultraviolet rays. X-rays. radar waves. gamma rays. 4. In order of increasing light-transmitting capabilities of materials, which is the correct sequence? (1 point) transparentopaquetranslucent opaquetransparenttranslucent opaquetranslucenttransparent translucenttransparentopaque 5. Which of the following occurs as a light wave bends when it passes from one medium into another? (1 point) constructive interference refraction destructive interference reflection

Jennifer Patterson

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Zach Chandler on October 9, 2018

1. An electromagnetic wave in vacuum has a wavelength of 0.07 m. What is its frequency? (1 point) f = 3.0 • 108 m/s f = 4.3 • 109 Hz f = 3.0 • 109 Hz f = 4.3 • 108 m/sAnswer.1) The speed of electromagnetic waves is the speed of light, c. 2) The relationship between speed, frequency and wavelength of a wave is speed = wavelength by the frequency.Solve for the frequency, the frequency, f = speed / wavelength f = c / 0.07 m = 3*10^8 m/s / 0.07 m = 4.3 * 10^9 2 Hertz. Which of the following occurs as light travels farther from its source? (1 point) Far from the source of photons, are collected in a small area. The intensity of the light increases as photons move away from the source. The source emits less light as photons move away from it. Far from the source, photons spread over a larger area.Answer:Far from the source, photons spread over a larger area. 3. The infrared radiation has a wavelength shorter than that of (1 point)of the sun's uv rays. X-rays radar waves. the gamma-rays.Answer: radar waves.Note that all the radars use radio waves, and the order of the wavelength are:radio (longest) > ir > u-v ray > x-ray > gamma ray (shortest) 4. In order of increasing light-transmitting capabilities of materials, which is the correct sequence? (1 point) transparentopaquetranslucent opaquetransparenttranslucent opaquetranslucenttransparenttranslucenttransparentopaqueopaque < translucent < transparent.Thi is opaque and does not allow the passage of light, translucent to allow light to pass through in some degree transparent and allowing the maximum passage of light. 5. Which of the following occurs as a light wave bends when it passes from one medium to another? (1 point) constructive interference of refraction, destructive interference reflectionRefraction.Refraction is the change in the direction of the light wave (in this case) due to the change of support..


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