Final answer:
A 'whip pan' is a camera technique where the camera is moved rapidly, resulting in a blur effect. Freezing action in photographs typically requires fast shutter speeds, such as 1/250th of a second or faster.
Step-by-step explanation:
The technique used to describe a very fast pan that blurs the image with its speed is known as a whip pan. This camera movement involves rapidly turning the camera from one position to another, creating a motion blur effect. The method is often used for dynamic scene transitions or to create a disorienting effect for the viewer.
To freeze action in photography, on the other hand, one would need a faster than normal shutter speed. Shutter speed refers to how long the camera's shutter remains open to let light in and expose the sensor or film. To capture images without blur, shutter speeds such as 1/250th of a second or faster are often necessary, especially if the subject is moving quickly.