Write T if the statement is true. Otherwise, write F.

1. An example of mechanical waves is an earthquake.
____ 2. The maximum displacement of a wave from the reference line is the crest.
____ 3. The lowest part of a wave is the trough.
____ 4. The crests and troughs of transverse waves move parallel to the reference line.
____ 5. In longitudinal waves the direction of compression and rarefaction is perpendicular to the direction of propagation.
____ 6. The period is the time it takes for one wave cycle to travel a distance of a wavelength.
____ 7. Destructive interference occurs when the magnitude of the displacement of the resulting wavefront is lower compared to the amplitudes of each of the original wavefronts.
____ 8. When two waves are in phase the amplitude will increase.
___ 9. When two waves are out of phase there is partial or total cancellation.
____ 10. In the electromagnetic spectrum, the highest wavelength are those of the AM or amplitude modulation waves.
____ 11. Health experts say that excessive exposure to high-frequency radio waves is beneficial to health.
____ 12. A changing electric field produces a magnetic field and a changing magnetic field produces gamma rays.
____ 13. The interchanging electric and magnetic fields produce an invisible wave that can travel even through a vacuum like outer space.
____ 14. Microwaves are extremely short; hence, their frequencies are very high.
____ 15. Mobile phones use transmitter chips to produce microwaves.
____ 16. A microwave oven uses a magnetron which converts electrical energy into radiation.
____ 17. Infrared waves have wavelengths longer than those of microwaves but shorter than those of visible light.
____ 18. Infrared waves are emitted by cold objects.
____ 19. White light is separated into its components by a prism through a process called dispersion.
____ 20. A device that emits a very narrow and focused beam of light.


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