Certified Professional Photographer (CPP) Practice Exam

Which type of communication do radio triggers use?

1. AC current

2. sound waves

3. radio waves

4. infrared signals

The correct answer is: radio waves

Radio triggers utilize radio waves for communication. This method allows for wireless activation of devices such as camera shutters or flash units from a distance, which is particularly beneficial in photography settings where physical connections may be cumbersome or limiting. The radio wave communication enables reliable signal transmission even in environments with obstacles or interference that might hinder other types of signals. Unlike sound waves, which require air to transmit and may be influenced by distance and surrounding noise, radio waves can travel through various mediums without the same limitations. Additionally, while infrared signals operate on a line-of-sight basis and can be obstructed by physical barriers, radio waves can penetrate such obstacles, enhancing versatility and practicality in triggering equipment from various angles and distances. AC current refers to electrical power, not a communication method, making it irrelevant in this context.