Tag: physics

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Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

Amplitude of wave is:

  1. the distance wave moves in one second

  2. distance wave moves in one time period of wave

  3. maximum distance moved by medium particles on either side of mean position

  4. distance equal to 1 wavelength
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amplitude is the maximum distance moved by medium particles on either side of mean position.

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

If the density of  sound is increased by a factor of 100, by how many decibles is the sound level increased?

  1. 100 dB

  2. 1000 dB

  3. 20 dB

  4. 30 dB
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The decibel level change is calculated using the formula delta dB = 10 * log10(I2/I1). Since the intensity (or density of sound energy) increases by a factor of 100, the change is 10 * log10(100) = 10 * 2 = 20 dB.

Multiple choice physics sound and noise musical sound and scale pleasant, unpleasant sounds and noise pollution sound noise and pollution

State whether the given statement is True or False :
The part of the ear is damaged most easily by continued exposure to loud noise is stirrup.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sounds can be harmful when they are too loud, even for a brief time, or when they are both loud and long-lasting. These sounds can damage sensitive structures in the inner ear and cause noise-induced hearing loss (NIHL).
With intense exposures (>/= 140 dB SPL), a portion of the organ of Corti is displaced from its position on the basilar membrane and is often found floating within scala media. Swollen hair cells are found at the edges of the lesion and signs of damage are apparent in the nonmyelinated nerve fibers of the organ of Corti both within and adjacent to the displaced portion.
With moderate-level exposures for long durations such as those found in noisy industries (i.e., </= 90 dB SPL), a few scattered sensory (i.e., hair) cells probably degenerate within the organ of Corti during each day of work. In general, the noise-induced loss of hair cells is very gradual. The amount of structural damage which is present in a given ear depends on its auditory history. The longer the exposure, the greater the number of missing sensory cells.
Hence, the part of the ear is damaged most easily by continued exposure to loud noise is hair cells.