Electromagnetic radiation is more common than you think. Radio and TV stations emit radio waves when they broadcast their programs; microwaves cook your food in a microwave oven; dentists use X rays to check your teeth. Even though they have different names and different applications, these types of radiation are really all the same thing: electromagnetic (EM) waves, that is, energy that travels in the form of oscillating electric and magnetic fields.
A. Which of the following statements correctly describe the various applications listed above?
Check all that apply.
a. All these technologies use radio waves, including low-frequency microwaves.
b. All these technologies use radio waves, including high-frequency microwaves.
c. All these technologies use a combination of infrared waves and high-frequency microwaves.
d. Microwave ovens emit in the same frequency band as some wireless Internet devices.
e. The radiation emitted by wireless Internet devices has the shortest wavelength of all the technologies listed above.
f. All these technologies emit waves with a wavelength in the range 0. 10 to 10.0 m.
g. All the technologies emit waves with a wavelength in range 0.01 to 10.0 km.
B. Based on this information, which of the following statements is correct?
a. The earth absorbs visible light and emits radiation with a shorter wavelength.
b. The earth absorbs visible light and emits radiation with a longer wavelength.
c. The earth absorbs visible light and emits radiation with a lower frequency.
d. The earth absorbs visible light and emits radiation with a higher frequency.