1) A child on a playground swing makes a complete to-and-fro swing each 2 seconds. The period is:
0.5 Seconds
2 Seconds
I think the answer is 2. Am I correct?
2) The period of a 440 Hertz sound wave is ___ seconds.
1/440
440
I think the answer is 440. Am I correct?
1) You are correct
2) No. 440 Hz means 440 cycles per second. Each cycle lasts 1/440 second.
0.0022
1) You are correct! The period of an event is the time it takes to complete one full cycle. In this case, the child on the swing makes a complete to-and-fro swing in 2 seconds, so the period is indeed 2 seconds.
To get the answer, you need to understand the definition of period and identify that the question is asking for the time it takes to complete one full cycle.
2) I'm sorry, but you're incorrect on this one. The period of a sound wave is the time it takes to complete one full cycle. In this case, the sound wave has a frequency of 440 Hertz. Frequency is defined as the number of cycles per second.
To find the period, you need to divide 1 second by the frequency. So the correct answer is 1/440 seconds.
To get the answer, you need to know the definition of period and remember that frequency is the number of cycles per second. Then, apply the formula for period by dividing 1 second by the frequency.