Us economic influence in other countries led to diffusion.

United States is said to be the country with highest economy rates, making it a highly influential country. Other countries tend to view the United States as a role model all over the globe. This causes a cultural diffusion since people outside United States tend to study what makes the US so powerful. As an effect, culture or traditions are being followed as influenced to change their own country's economy. 

Sonar is an application of the doppler effect used by submarines.  this test was on k12.