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Khan Academy: 2757 products

Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere. All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …

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Physics: Parabolic mirrors 2

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Parabolic Mirrors 2 Physics Learn about the basic principles that govern the physical world around us. Solid understanding of algebra and a…

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Class 11 Physics (India): Wave interference

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David explains wave interference and solves a few examples to find the value of the total wave when two wave pulses overlap. Class 11 Physi…

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Health and medicine: Pharyngitis

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Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

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Health and medicine: The basal ganglia - The direct pathway

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Class 11 Physics (India) - Hindi: Horizontally launched projectile (Hindi)

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In this video Ram explains how to solve for the horizontal displacement when the projectile starts with a horizontal initial velocity. He a…

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Class 11 Physics (India): Properties of periodic waves

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Amplitude, period, frequency and wavelength of periodic waves. How to calculate wave velocity. Class 11 Physics (India) Let's learn, practi…

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Organic chemistry: Bonds as springs

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How frequency of bond vibration can be compared to the oscillation of a spring. Organic chemistry Sal and Jay cover topics covered in colle…

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Class 11 Physics (India): Doppler effect introduction

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Learn about the Doppler effect and how it explains the change in frequency of a wave when its source and an observer are moving. Class 11 P…

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Health and medicine: Stages of dementia and Alzheimer's disease

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Class 11 Physics (India): Unit vector notation (part 2)

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More on unit vector notation. Showing that adding the x and y components of two vectors is equivalent to adding the vectors visually using …

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Health and medicine: Transudate vs exudate

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In a pleural effusion, different fluids can enter the pleural cavity. Transudate is fluid pushed through the capillary due to high pressure…

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Health and medicine: Astrocytes

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This video describes the structure and function of astrocytes. By Matt Jensen. Health and medicine The medical world can be a confusing pla…

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Class 10 Physics (India): Thin lens formula

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Let's derive the thin lens formula which connects the object distance to the image distance. Class 10 Physics (India) Let's explore the mys…

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Class 11 Physics (India) - Hindi: Visualizing vectors in 2 dimensions (Hindi)

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Visualizing, adding and breaking down vectors in 2 dimensions. Class 11 Physics (India) - Hindi To help students who prefer to learn by wat…

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Class 11 Physics (India): Derivative & the direction of a function

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Sal analyzes various graphs to find intervals where the derivative of the graphed function is positive or negative. Class 11 Physics (India…