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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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Line Spectra

The Line Spectra Concept Builder targets a learner's understanding of line spectra. The Concept Builder has three activities - Paragraph Completion, Line Identification, and Match That Color. In Paragraph Completion, learners complete a paragraph by selecting from a short list of terms which fill in the blanks. In Line Identification, learners are given a set of three values of either frequency, wavelength, or photon energy associated with three colored lines on an emission spectrum; learners must identify the color associated with each value. In Match That Color, learners are given a scaled energy level diagram with four energy states. Three electron transitions are identified and learners must match each to one of three given emission line colors. The Concept Builder includes 22 questions organized into 7 Question Groups and spread across the three activities. Question-specific help is provided for each of the 7 Question Groups. The immediate feedback makes it great for independent practice. The use of the Concept Builder with a Task Tracker account makes it suitable for both in-class work and homework.

Users are encouraged to open the Concept Builder and begin. There is no need for an activity sheet for this Concept Builder.

Learners and Instructors may also be interested in viewing the accompanying Notes page. Technical information, teaching suggestions, and related resources that complement this Interactive are provided on the View Notes.

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