Question

Q2. Answer in one word:
1. Two important properties of any sound.
2. Time taken by a vibrating body to complete one vibration.
3. Vibrations of frequency higher than 20,000Hz.
4. Vibrations of frequency lower than 20 Hz.
5. The frequency of a vibrating body that makes 512 vibrations in a second.
6. Unwanted and unpleasant sounds.
7. It determines the shrillness or pitch of a sound.
8. Length of vocal chords in men.
9. Name any four causes of noise pollution our surroundings.
10. Name any two health related problems caused due to noise pollution.

Answer 1

Answer:

1. The two main properties of sound are frequency and amplitude. The frequency of the sound waves determines the pitch of the sound. The amplitude of sound determines the loudness. The quality of sound is affected by the pitch and the loudness.
2. The unit of vibration is hertz. The number of oscillations of an oscillating body per second is known as frequency. Complete step by step answer: The time taken by a vibrating body to complete one vibration is time period.
3. High frequencies produce more oscillations. The units of frequency are called hertz (Hz). Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. Frequencies above 20,000 Hz are known as ultrasound.
4. Infrasound, sometimes referred to as low-frequency sound, describes sound waves with a frequency below the lower limit of human audibility (generally 20 Hz). ... The ear is the primary organ for sensing low sound, but at higher intensities it is possible to feel infrasound vibrations in various parts of the body.
5. Answer:512herzExplanation:frequency is number of oscillations per secondso 512/1=512.
6. Unwanted or unpleasant sounds are known as noise. Sounds that are melodious and pleasing to ear are known as music. Unwanted or unpleasant sounds are known as noise. If one is subjected to loud unpleasant sound continuously for a long time, then it may cause temporary hearing impairment.
7. The frequency determines the shrillness or pitch of a sound. If the frequency of vibration is higher we say that the sound is shrill and has a higher pitch.
8. The human vocal cords are roughly 12 – 24 mm in length, and 3–5 mm thick.
9. CAUSES OF NOISE POLLUTION

Traffic noise.

Air traffic noise.

Construction sites.

Catering and night life.

10.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 ...

Answer 2

Answer:

Q.2

1. frequency and amplitude

2.i think it is frequency

3. ultrasound

4. infrasound

5.( 1 Hz = 1)

6. ( noise) ( fork on a glass)

7. frequency

8. 20mm

9

. traffic noise

. air traffic noise

. animals

. construction sites

10. respiratory agitation, BP