Nodding flowers are best adapted for the long hummingbird beak. Hummingbirds intrigue with their tiny bodies and rapidly fluttering, buzzing wings. They are a joy to watch and planting a garden to attract hummingbirds is rewarding. When planning, there is more to consider than color when choosing plants.
So, while pretty much everyone can hear frequencies of 8,000 Hz, most people over the age of 40 canât hear 15,000 Hz. Note that YouTube has compressed this video so, unfortunately the 19,000 Hz frequency has been lost. But that doesnât matter to me because I didnât come anywhere close to being able to hear it. Sigh. Go and watch the video above to find out how young (or old) your ears really are and prepare to be depressed.
40 dB sounds twice as loud as 30 dB and 8 times as loud as 10 dB (10 to 20 to 30 to 40 = 2 x 2 x 2 = 8). Normal hearing ranges from 0 to 20 dB in all frequencies. From here on, the assumption is that you have a sensorineural hearing loss (that you have nerve damage to the inner ear).Nerve damage, unless sudden, is permanent. For conductive hearing losses, see your otolaryngologist (your ENT physician).f all of the X's (for the left ear) and all of the 0's (for the right ear) fall above the line you just drew, you have normal hearing. If anything is below that 20 dB line, you have a hearing loss. Your hearing loss is classified according to how far down the graph the marks go, and in what freqencies the loss occurs.