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What is the time period of a signal with a frequency of 200 Hz?
1/200 or 0.005 seconds or 5 milliseconds.
If a nerve signal travels to and from the brain at a speed of 30 meters per second how long would it take the signal to travel 3 meters?
It would take the signal 0.1 seconds to travel 3 metres, given the parameters that you have given.
What is the probability of getting a green light at a signal if it is green for 20 seconds then yellow for 5 seconds then red for 25 seconds?
This is like a marble problem, selecting a normal time at a standard traffic light, looking for the green light time. Adding all the times, we have 20 + 5 + 25 = 50. Now, 20 of those 50 seconds are green, thus, the probability is "good/total", which is 20/50 = 2/5 = .4 or 40%.
What does it mean when something says circle the signal words?
It means that you should draw a circle around the individual words that are signal words... that signal the reader about something. Depending on what type of signal words you are working on, these could be illustrations to the reader that there is more coming, that something important is coming, or signals that tell you what the author thinks... like perhaps they aren't sure of what they are saying. Please see the related link for examples of different types of signal words.
How much time would elapsed between sending of a radar signal to the moon and the creation of an echo?
Around 2.5 seconds. The distance moon varies between approx 362.6 thousand km and 405.4 thousand km. At the speed of light in space (approx 300,000 km per second), the radio waves would take between 2.42 and 2.70 seconds.
