# Physical Science: Waves, Sound, and Light, Book O

## Chapter 3: Electromagnetic Waves

### Standardized Test Practice

 1. Which of the following types of electromagnetic waves has a frequency greater than ultraviolet waves? A) X rays B) infrared waves C) microwaves D) visible light 2. Which of the following colors of visible light has the lowest energy? A) blue B) green C) red D) yellow 3. Which of the following electromagnetic waves carries the most energy? A) ultraviolet waves B) infrared waves C) microwaves D) visible light 4. How does the intensity of infrared waves emitted by the Sun change as the wavelength of the ultraviolet waves increases? (12.0K) A) The intensity decreases. B) The intensity doesn't change. C) The intensity increases D) The intensity increases, then decreases. 5. The intensity is greatest for which of these types of electromagnetic waves from the Sun? (12.0K) A) visible light B) infrared waves C) both infared and ultrviolet waves D) ultraviolet waves 6. What is the direction of the magnetic field produced by electrons moving along a straight wire? A) in the same direction as the electron flow B) opposite the direction of the electron flow C) circling around the wire D) outward in all directions from the wire 7. How are electromagnetic waves affected as the frequency of the waves increases? A) energy and wavelength increase B) energy and wavelength decrease C) energy decreases, wavelength increases D) energy increases, wavelength decreases 8. Which of the following is not true about electromagnetic waves like the one in the illustration? (7.0K) A) They always travel at 300,000 km/s. B) Both fields are strongest at the same times. C) They are produced by a charged particle in motion. D) They can travel through matter. 9. A radio station broadcasts at a frequency of 89.5 MHz. What is the wavelength of these radio waves? A) 0.298 cm B) 0.335 cm C) 2.98 m D) 3.35 m 10. Which of the following properties of a transverse wave is the distance from one trough to the next? A) amplitude B) frequency C) intensity D) wavelength