“Sympathetic vibrations” refers to

An iron nail is attracted

Strings that have more mass on a musical instrument than others produce notes of

Double the frequency of sound and you also double its

The source of all wave motion is

Yellow light has a frequency of about 5.5×1014 Hz. What is the wavelength in air?

If water at 0°C slightly increases in temperature, the water

In practice, a good insulator

What moves from place to place in wave motion is

Compared to the amount of current that flows from a battery and into a circuit, the amount of current that returns to the battery is