Tuning Fork Blue Steel 640Hz
Tuning Fork Blue Steel 640Hz
Student's name
First and last name, and class if you know it. This goes on the pack label.
Pickup available at Mega DC – Tweed Heads South
Usually ready in 24 hours
640Hz, in blue steel, for $7.50
Single blue steel tuning fork, 640Hz. Sold individually.
640Hz sits above middle C and comfortably inside the range where a struck fork rings clearly and long enough to demonstrate with. It is a working laboratory fork rather than a musical tuning reference - the frequency is a round number for calculation, not a note.
What you can do with one fork. Show that sound is vibration by touching a struck fork to water. Show that sound needs a medium. Demonstrate beats against a second fork of a nearby frequency. Measure the speed of sound in air with a resonance tube - 640Hz gives a quarter wavelength of about 13cm at room temperature, which fits a standard tube.
Blue steel is the standard laboratory finish - a heat-treated oxide layer that resists rust without adding mass that would change the frequency.
What the supplier does not publish: the fork's length, its frequency tolerance, and whether a striking block is included. Assume no block. If you need a stated tolerance for quantitative work, ask us and we will get it before you order.