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3 years ago

Will two separate 50db sounds together constitute a 100db sound explain mathematical

1 answer:

5 0

Putting together two distinct 50 dB sound, do not create a 100 dB sound. Since decibels are logarithm of energy, creating two sounds together only makes the energy increase but the logarithm only goes up by somehow little. So increasing the sound by 10 dB, only makes it 10000 times louder because each 10 dB increase in sound makes the sound 10 times louder.

Twice as loud is an increase of 10Log (2) = 3.01 dB. So, 53,01 dB is twice as loud as 50dB.

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If a FM radio station broadcasts at 80. 3 MHz (megahertz), what is its wavelength in m (speed of light 3. 0 x 108 m/s)

hammer [34]

Answer:

Wavelength = 3.74 m

Explanation:

In order to find wavelength in "metres", we must first convert megahertz to hertz.

1 MHz = 1 × 10⁶ Hz

80.3 Mhz = x

x = 80.3 × 1 × 10⁶ = 8.03 × 10⁷ Hz

The formula between wave speed, frequency and wavelength is:

v = fλ [where v is wave speed, f is frequency and λ is wavelength]

Reorganise the equation and make λ the subject.

λ = v ÷ f

λ = (3 × 10⁸) ÷ (8.03 × 10⁷)

λ = 3.74 m [rounded to 3 significant figures]

8 0

3 years ago

What is the half-life of a compound if 75 percent of a given sample of the compound decomposes in 60 min? assume first-order kin

LenKa [72]

The amount left of a given substance can be calculated through the equation,
A = (A0) x 0.5^n/h
From the given scenario,
A/A0 = 0.75 = 0.5*(60/h)
The value of h from the equation is 144.565 minutes.

6 0

4 years ago

What is the weight of a 20 kg box on the Earth? A) 2 N B) 20 N C) 200 N

jarptica [38.1K]

C 200 Newtons ........

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3 years ago

a police officer parked on the side of the rode clockes a driver at a constant 130km/h (passing the stopped car). if the officer

nignag [31]

Answer

given,

speed of the vehicle = 130 Km/h

officers accelerates at = 12 km/h/s

time taken by the driver to catch the vehicle = ?

at time t second

$130 t = \dfrac{1}{2}at^2$

$260 t - 12 t^2 = 0$

t (12 t - 260 )= 0

12 t = 260

t = 21.67 s

v = u + at

v = 12 × 21.67

v = 260 Km/h

8 0

4 years ago

How to write an advertisement about child labour

Reil [10]

Answer:

by writing everything happen to her or him

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3 years ago