He is measuring the frequency of the wave. To get his answer he must divide his count by 10 to give cycles per second.
He is counting the waves peak to peak over a set time.
.
The frequency is 720Hz
Frequency APEX
Measure from the rest position to a crest or a trough
The physical property and material of airplane body are quite a number. The material mainly used is aluminum and its properties include being light in weight, strong and sliver in color.
an intensive property is the one that is independent from the mass of number of particles in a system while an extensive proeprty depends on them. Energy (e.g. heat) is a property that depend on the mass or the number of particles in a system. In other words, energy is an extensive property.
The phone number of the Garrett Museum Of Art is: 260-357-4917.
Garrett Wilson is number 28 on the Florida Panthers.
Diante Garrett is number 8 on the Utah Jazz.
Garrett Temple is number 17 on the Washington Wizards.
Garrett Gilkey is number 65 on the Cleveland Browns.
Garrett Graham is number 88 on the Houston Texans.
Garrett Jones is number 46 on the Miami Marlins.
The phone number of the Garrett Historical Railroad Museum is: 260-357-5575.
The phone number of the Garrett Public Library is: 260-357-5485.
Garrett Richards is number 43 on the Los Angeles Angels.
Garrett Celek is number 88 on the San Francisco 49ers.
Garrett McIntyre is number 50 on the New York Jets.