A chicken taco salad without dressing at one Mexican restaurant chain contains a whopping 1,180 calories. In addition, it provides 75 grams of fat, 79 grams of carbohydrate, 52 grams of protein, 13 grams of fiber, and 2,160 mg of sodium.
Infrared Light. Infrared (IR) light is light with lower frequency (higher wavelength) than visible light. IR light has frequencies ranging from 3*1011 to 4*1014 Hz (300 GHz to 400 THz) and wavelengths from 7.5*10-7 m to 10-3 m (750 nm to 1 mm).
IR and RF remote controls. Many embedded devices use handheld IR and RF remote controls. TVs and radios typically have Infrared (IR) remote controls. Most cars now have a radio frequency (RF) remote key fob. Wireless keyboards and mice use RF links at 27Mhz or 2.4Ghz. Cordless phones use 900Mhz, 2.4Ghz, and now 5.8Ghz.