about 20 seconds

The largest waves occur where there are big expanses of open water that wind can affect.

How is Wave Height measured? Wave height is the vertical distance between the crest (peak) and the trough of a wave. Some other definitions: Still-Water Line is the level of the lake surface if it were perfectly calm and flat.

The dominant wave period (in seconds) is a wave period associated with highest energetic waves at a specific point or area in the total wave spectrum and is always either the swell period or the wind- wave period. Dominant wave period is also known as the “peak” period.

The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years. The period of orbit for the Earth around the Sun is approximately 365 days; it takes 365 days for the Earth to complete a cycle.

Speed = Wavelength x Wave Frequency. In this equation, wavelength is measured in meters and frequency is measured in hertz (Hz), or number of waves per second. Therefore, wave speed is given in meters per second, which is the SI unit for speed.

If you want to calculate the frequency from wavelength and wave velocity, remember they should have the same length unit. Divide the wave velocity by the wavelength. Convert the result to Hertz. 1/s equals 1 Hertz.

1 cycle per second

The main difference between Frequency and Hertz is that the Frequency is a number of occurrences per unit time and Hertz is a SI unit for frequency. The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

A 20-120 Hz rating is best for bass in most subwoofers. The lower the Hz, the more is the bass you can get. Some of the best subwoofers in the market have this Hz range. If you are buying a subwoofer that has a fixed Hz rating, you should ensure it is lower than 80 Hz if the bass is important to you.

Frequency Response: 20-20kHz ±3dB = Good.

Some headphones offer wider ranges (for example, 5 to 33,000 Hz), but better frequency response does not always mean better sound quality. Below 20 Hz bass frequencies can be felt more so than heard, treble frequencies over 20,000 Hz are not always audible.

The ‘normal’ hearing frequency range of a healthy young person is about 20 to 20,000Hz. Though a ‘normal’ audible range for loudness is from 0 to 180dB, anything over 85dB is considered damaging, so we should try not to go there. As we age, it’s the upper frequencies we lose first.

People of All ages without a hearing impairment should be able to hear the 8000hz. People under 50 should be able to hear the 12,000hz and people under 40, the 15,000hz. Under 30s should hear the 16,000hz, and the 17,000hz is receivable for those under 24. MORE: Test!

The Four Levels of Hearing Loss – Where Do You Fit?

1. Mild Hearing Loss. The quietest sounds people with mild hearing loss can hear are between 25 and 40 dB.
2. Moderate Hearing Loss. On average, someone with moderate hearing loss cannot hear sounds that are less than 40-75 dB.
3. Severe Hearing Loss.
4. Profound Hearing Loss.