People tint windows dark to encourage _____.

Light travels fastest in _____.

Which of the following media can sound NOT travel through?

Which part of the ear is responsible for amplifying sound?

In which of the following places would you most likely hear echoes?

A particle of electromagnetic radiation is called a _____.

The electromagnetic spectrum is the entire range of electromagnetic waves with different _____ and _____.

When an electric field is strongest in one direction, the magnetic field is strongest in which direction?

Normally, atoms are electrically neutral because there are ____.

A circuit that has two or more separate paths for electrons to follow is a(n)____.

Which of the following statements about the forces between charged objects is not true?

As a nail approaches the south pole of a magnet, what happens to its magnetic domains? (Hint:opposites attract)

How can you make an item that is made of magnetic material become a permanent magnet instead of a temporary magnet?

Which of the following describes both an electromagnet and a permanent magnet?

An electric generator can produce current that changes direction in a regular pattern. This is called which of the following?

The location of the strongest magnetic field is the ____.

Which statement is true?

Current that does NOT reverse direction is called ____.

The region around a magnet where the magnetic forces act is the ____.

When a power plant sends out high voltage electricity for long distance transmission, what is needed to make the electricity usable in houses?

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