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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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Decibel Scale - Directions

Using the Decibel Scale Concept Builder is quite simple. You will be presented with the deciBel rating of Sound Source A and told that Sound Source B is 10n times more or less intense than Sound Source A. You must determine the deciBel rating of Sound Source B. Your answer needs to be entered into the answer field. There are two ways to enter your answer. You can tap in the field and enter your answer using your keyboard. This is the ideal means of entering an answer for those using desktop and laptop computers. But if you have a touch screen device, you may prefer to use our own built-in number pad. Clicking on the number pad icon that displays next to the answer field pops up the number pad. You can tap on the number keys to enter your answer. Using our custom number pad allows you to enter the answer without your device keyboard covering the better half of the question.Once you are satisfied with your answer, tap on the Check Answer button. Your answer will be evaluated and feedback will be given. The Progress Report will be updated and you will be given a new question.

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

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