Which example shows that electromagnetic waves can travel without moving through a specific material (medium)?
a.
light traveling through a glass window
b.
light traveling to the earth from an orbiting satellite
c.
rings made by a pebble when dropped in water
d.
sound traveling through air

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

Work = force × a. work b. energy c. distance d. momentum

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).