A sound wave has a certain amplitude and a certain frequency. A second sound wave is quieter and lower in pitch than the first sound wave. The second wave has:
A a larger amplitude and a greater frequency.
B a larger amplitude and a smaller frequency.
C a smaller amplitude and a greater frequency.
D a smaller amplitude and a smaller frequency.
What is the approximate range of hearing of a healthy human ear?
A 2.0 Hz to 2.0 kHz
B 2.0 Hz to 20 kHz
C 20 Hz to 2.0 kHz
D 20 Hz to 20 kHz
A candle flame is placed in front of a loudspeaker. The loudspeaker produces a sound wave that causes air particles to vibrate. The vibrating air particles make the candle flame vibrate in the same direction as the air particles. Which row shows the direction of vibration of the candle flame, and the nature of sound waves?
A
B
C
D
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