Which statement about electric force is true?
a) it is a purely attractive force.
b) it is a purely repulsive force.
c) it is both an attractive and a repulsive force.
d) it is neither an attractive nor a repulsive force.

What do radio waves and microwaves have in common? both are at the side of the spectrum that has the shortest wavelengths. both are at the side of the spectrum that has the lowest radiant energy. both are at the side of the spectrum that has the lowest frequency. both are found next to visible light on the electromagnetic spectrum.

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.