Definitely true, surveys and interviews aren’t flawless but you can collect lots of data from them
Gravitational potential energy is an object that possesses because of its position in a gravitational field
The frequency of a wave is the number of waves that passes through a point in a certain time. The less waves that pass in a period of time the lower the frequency of the wave. The more waves that pass in a period of time the higher the frequency of the wave. When measuring wave length the time period used is usually one second.
