Question

please tell me full true or false please .​

Answer 1

1. True
2. False
3. True
4. False
5. False

Answer 2

Answer:

1. True

2. False

3. True

4. False

5. False

Explanation:

1. 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.

2. Pertaining to VIBRATIONs and SOUND WAVEs whose FREQUENCY is too low to be heard as sound by the human ear, i.e. below about 20 Hz. The term is also used loosely to describe any low frequency sound. Compare: AUDIO, BASS, PULSE, RUMBLE, SONICS, SUBSONIC, ULTRASONIC.

3.In water, the particles are much closer together, and they can quickly transmit vibration energy from one particle to the next. This means that the sound wave travels over four times faster than it would in air, but it takes a lot of energy to start the vibration.

4. Sounds heard by a listener after the reflections of sound waves from any surface is called echoes .

Pitch, in music, position of a single sound in the complete range of sound. Sounds are higher or lower in pitch according to the frequency of vibration of the sound waves producing them.

5. Exposure to prolonged or excessive noise has been shown to cause a range of health problems ranging from stress, poor concentration, productivity losses in the workplace, and communication difficulties and fatigue from lack of sleep, to more serious issues such as cardiovascular disease, cognitive impairment, tinnitus

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