Sound Waves Calling

Question: What is the name for a speed greater than that of sound?

Answer: Speed that just exceeds the speed of sound is called Mach 1, and faster speeds are measured as multiples of this speed. Mach 2 is twice the speed of sound.

Question: Which of these amplifies a voice?

Answer: A megaphone is a cone-shaped device that is used to amplify a voice. Often you will see a megaphone used at a political rally or sports match.

Question: What kind of sound is too high for humans to hear?

Answer: Ultrasound is sound of a frequency so high that a human ear cannot hear it.

Question: The relative loudness of a sound is measured by:

Answer: Decibels are units used to measure relative loudness.

Question: What is another name for the voice box?

Answer: At the base of the throat is the larynx, or voice box. Inside the larynx are the vocal cords.

Question: What is pitch?

Answer: Pitch is the highness or lowness of a sound, measured by the frequency of its waves in hertz (cycles per second).