Which of the following is true about all electromagnetic waves in a vacuum

What kinds of ions do acids and bases form in water

How many centuries would it take for humans originating in Africa to travel to china some 10000 km away? at a rate of 1 km per year.

An ice sheet 5m thick covers a lake that is 20m deep. what is the temperature of the water at the bottom of the lake? explain your answer. coefficient of volume expansivity at 20 degree centigrade is 2.1x10^-4

If x=450 mm, determine the mass of the counterweight s required to balance a 90-kg load, l.

What is true about all of these atoms? They cannot be solids. They are the largest units of matter. They are the only types of atoms that exist. They cannot be divided.

How does the wave model of electrons orbiting the nucleus account for discrete energy values?

An ecosystem is all the populations of organisms that live together and A. the microorganisms that depend on them. B. the organisms that generate energy from sunlight. C. the physical factors with which they interact. D.

Which statement about magnetic poles is accurate? A) Same magnetic poles attract, while different magnetic poles repel. B) Same magnetic poles attract, while different magnetic poles attract.

Power is measured in: A) J/s B) J2/s C) s/J D) s2/J

The amount or the strength of force is called its