for this answer it's false i made a 90 on this test :)
This statement is incorrect. Sound waves with frequencies higher than 20000 Hz are referred to as ultrasonic waves, not subsonic waves. Subsonic waves have frequencies lower than the audible range.
Ultrasonic. Or do you mean what causes them : all types of electrical machinery including TV sets, humming birds, mice (singing) insects.
The range of frequencies that people can hear is generally from 20 Hz to 20,000 Hz. However, individual hearing abilities can vary slightly, with younger individuals typically being able to hear higher frequencies than older individuals.
Sound waves with frequencies above 20,000 Hz are considered ultrasonic. These frequencies are above the upper limit of human hearing and are commonly used in applications like medical imaging, cleaning, and animal communication.
The audible range of frequencies for humans is, on average, between 20 Hz and 20kHz, although it varies between individuals. As humans age, however, this range normally decreases, especially on the higher end of the range.
Sound waves with frequencies higher than 20,000 Hz are considered ultrasonic and are beyond the range of human hearing. Some animals, like dogs and bats, can hear frequencies in this range, but most humans cannot detect them. Ultrasonic waves are often used in technology for applications like medical imaging, cleaning, and communication.
Sound waves with frequencies above 20,000 Hz are considered ultrasonic. These frequencies are above the upper limit of human hearing and are commonly used in applications like medical imaging, cleaning, and animal communication.
The audible range of frequencies for humans is, on average, between 20 Hz and 20kHz, although it varies between individuals. As humans age, however, this range normally decreases, especially on the higher end of the range.
Ultrasonic. Or do you mean what causes them : all types of electrical machinery including TV sets, humming birds, mice (singing) insects.
typically 20-20000 Hz - but this range will decrease with age
The frequencies (cycles per second) of the audible vibrations are between 20 Hz and 20000 Hz.
typically 20-20000 Hz - but this range will decrease with age
Sound waves with frequencies higher than 20,000 Hz are considered ultrasonic and are beyond the range of human hearing. Some animals, like dogs and bats, can hear frequencies in this range, but most humans cannot detect them. Ultrasonic waves are often used in technology for applications like medical imaging, cleaning, and communication.
3.3% of 20,000= 3.3% * 20000= 0.033 * 20000= 660
42% of 20000= 42% * 20000= 0.42 * 20000= 8,400
ANSWER: 380019% of 20000= 19% * 20000= 0.19 * 20000= 3800
20000
20000