Why do electromagnetic waves not require a medium for travel? a. because electromagnetic waves travel too fast for stationary particles to move with them b. because electromagnetic waves transmit energy without compressing the particles of the medium c. because electromagnetic waves generate their own particles for compression and use these for movement d. because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-d space?

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?

Abody covers a semicircle of radius 7cm in 5s .find its linear speed

How much hereditary information is contain in a human sex cell