Answer Happy

What is true about semiconductors? (1 point) O They are so rare that it's unusual to see them in daily life. O It is hard for electrons to move through them. You can change how easily electrons move through them. It is easy for electrons to move through them.

Which experiments lead to understanding the causal relationship between magnetic fields and electric current? (1 point) discovering that a current generated a change in magnets and proving that this change was independent of the magnitude of the current in the conductor discovering that a moving magnet generated a current in a conductor and proving that the magnitude of the current depended on the number of coils in the conductor discovering that a current generated a change in magnets and proving that weaker magnets had the strongest effect on the current in the conductor discovering that a moving magnet generated a current in a conductor and proving that the magnitude of the current was independent of the number of coils in the conductor

The speed of a sound wave depends on O the frequency of the wave O the wavelength of the wave o the amplitude of the wave the density of the medium