A sound at 160 decibels is considered loud whereas a sound at 20 decibels is considered soft.
The intensity or volume of sound is measured in unit called decibel or dB. For normal conversation, the intensity of sound is 60 decibel. Loud noise for very long time can damage the ears and very loud sound can instantly harm the ear, causing hearing problems. Sound till the range of 70 decibel is considered safe for hearing. The intensity of sound at 120 decibel causes immediate hearing issues.
Sources of loud noise include crackers, Very high volume of television, radio or earphones. The loud sound can cause damage to cells and membranes in the ears. This damage is irreversible and hence leads to permanent hearing issues.
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The period of any wave is the time it takes for its angle
to go from zero to 2pi .
The 'sin' function is a wave. The angle of this one is (8pi t).
When t=0, the angle is zero.
Wonderful.
Now, how long does it take for the angle to grow to 2pi ?
I*n other words, when is (8pi t) = 2pi ?
Divide each side by '2pi': . . . . . 4 t = 1
Divide each side by ' 4 ': . . . . . t = 1/4
And there you are. Every time 't' grows by 1/4, (8pi t) grows by 2pi.
So if you graph this simple harmonic motion described by 'd', you'll
see the graph wiggle up and down with a period of 1/4 .
Answer:
Explanation:
The force of friction acting on the system
= .04 x 9.8 ( 10.2 + 7 )
= 6.74 N
Net force = 8.9 - 6.74
= 2.16 N
Acceleration in the system
= 2.16 / ( 10.2 + 7 )
= .12558 m / s ²
Contact force between boxes = FP
Considering force on box A
Net force = 8.9 - FP
Applying Newton's law on box A
8.9 - FP = 10.2 x .12558
= 1.28
FP = 8.9 - 1.28
= 7.62 N
Given the relationship: v = wavelength times frequency
this should be as simple as multiplying it out :)
for any other variable just rearrange
velocity = lambda x frequency
where lambda is the wavelength
units:
m/s = m x Hz (1/s)
