Problem 16 - Biology

Question

In sound, pitch is measured in __________ , and volume is measured in _____________. a. nanometers (nm); decibels (dB) b. decibels (dB); nanometers (nm) c. decibels (dB); hertz (Hz) d. hertz (Hz); decibels (dB)

Step-by-Step Solution

Answer

d. hertz (Hz); decibels (dB)

Step 1: Understand the Concept

Pitch in sound refers to how high or low a sound is perceived. This is typically measured in units of frequency.

Step 2: Identify the Relevant Units for Pitch

The frequency of a sound wave is measured in hertz (Hz). Each pitch corresponds to a specific frequency.

Step 3: Understand Volume Measurement

Volume refers to the loudness of a sound, which is measured in decibels (dB).

Step 4: Match the Correct Units

From the explanation, pitch is measured in hertz (Hz) and volume is measured in decibels (dB).

Step 5: Select the Correct Option

The correct option that matches these measurements is option d. hertz (Hz); decibels (dB).

Key Concepts

Pitch

Pitch refers to how high or low a sound seems to us. Consider a bird's chirp versus a lion's roar; they have different pitches. Scientists measure pitch using frequency, which is the number of sound wave cycles that occur in one second. Imagine ripples in a pond; frequency tells us how fast these ripples occur.

Volume

Volume is the measure of how loud or soft a sound is. Imagine whispering versus shouting. The intensity of the sound waves determines the volume. We measure volume in decibels (dB). Higher decibels mean louder sounds, and lower decibels mean softer ones. For perspective, a soft whisper might be around 30 dB, while a jet engine can reach up to 140 dB.

Hertz (Hz)

Hertz (Hz) is the unit used to measure frequency or pitch. One hertz equals one cycle per second. Think of it as counting how many times something happens every second. For example, if a sound wave vibrates 440 times per second, it has a frequency of 440 Hz. This particular frequency corresponds to the musical note A.

Decibels (dB)

Decibels (dB) are the units used to measure the volume or loudness of a sound. The decibel scale is logarithmic, meaning each increase of 10 dB represents a tenfold increase in intensity. Therefore, a sound at 60 dB is ten times more intense than one at 50 dB. This scale helps us handle the wide range of sounds we hear daily.

Frequency

Frequency is the number of times a sound wave cycles in one second, measured in hertz (Hz). Higher frequencies mean higher pitches, and lower frequencies mean lower pitches. For instance, a flute produces high-frequency sounds, while a bass drum produces low-frequency sounds. Understanding frequency helps us to grasp why different instruments and noises sound unique.