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Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

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Frequency and Period - Directions

Using the Frequency and Period Concept Builder is quite simple. There are three activities included in this Concept Builder, each with their own unique directions. In the first activity - Two Truths and a Lie - you will be presented three statements. Two are true and one is false. You must identify each statement as being True (T) or False (F). You do so by tapping on the statement. When you do, a letter - T for True or F for False will appear to the left of the statement.Continued tapping on the statement toggles your choice between True and False. As long as you have identified two True and one False statement, a Check Answers button will appear. Once you are satisfied with your selections, tap on the Check Answers button. Your answers will be evaluated and your Progress Report will be updated.

In the second activity - Case Studies - you are presented two sets of data - either two graphs or two numerical data sets. You must analyze the information in the data sets and determine in which case does the object have the greatest frequency or period. You indicate your answer by tapping on the answer field located below the graphic (where it says Tap Here!). Continued tapping toggles back and forth between the two answer options - A or B. Once you'e made a choice, a Check Answer button appears. When you are satisfied with the answer being displayed, tap on the Check Answer button. Your answer will be evaluated and your Progress Report will be updated.

In the third activity - Do the Math! - you must calculate the frequency or the period of a vibrating object ... and you must identify the unit on the answer. Tapping on the answer field pops up a number pad that must be used to enter your numerical answers. Use at least three significant digits. You can select the unit by tapping on the unit field to toggle between the three choices of units. As long as you have a numerical answer and a chosen unit, a Check Answers button appears. If you are satisfied with your numerical answer and unit, tap on the Check Answer button. If your unit is correct, then you will have a chance to correct it before your numerical answer is checked. Your answer will be evaluated and your Progress Report will be updated.

Your goal is to earn "Stars" and to complete one or more activities. Stars are earned when you show success on a particular question. Once you show success on all the questions for a particular activity, you will earn the Trophy for that activity.

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