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Serggg [28]
2 years ago
14

What is the sound level in a car when the intensity is 0.5 pW/m2?

Physics
2 answers:
Sholpan [36]2 years ago
5 0

Level of sound is given by equation

L = 10 Log \frac{I}{I_0}

here we know that

I = 0.5 pW/m^2

also the standard intensity of sound will be

I_0 = 1 pW/m^2

now we will use above equation

L = 10 Log\frac{0.5}{1}

L = -3.0 dB

So here it is no given option is correct as its level is coming - 3 dB

andreev551 [17]2 years ago
4 0

Answer: 1. C) 57 dB

2. A) 5.5 x 10^ -15 J

3. D) 1.4 m

4. D) 47 cm

5. A) 6.2 MHz

6. B) -18.2 dB

7. A) 2.8 uJ

8. C) 90 m

9. C) 511 W

10. C) 3.16 x 10^ -7 W/m^2

Explanation: 100% for quick check :)

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Answer:

Because the hot tea is hot from a microwave or coffee machine when iced tea is cold from ice in the tea.

Explanation:

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On the day Harvey is to present his dissertation, he wakes up with a severe headache. During the presentation, he feels no pain
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8 0
1 year ago
At higher speeds, how would you compensate for the decrease in field of vision
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5 0
3 years ago
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5g of ammonium nitrate was dissolved in 60g of water in an insulated container. The temperature at the start of the reaction was
Minchanka [31]

Answer: The energy absorbed by the reaction from the water is 996 Joules.

Explanation:

Energy absorbed by the reaction or energy lost by the water to the reaction,Q.

Mass of the the reaction  ,m = 60 g

Specific heat of water = c = 4.15 J\g ^oC

Change is temperature=\Delta T=19^oC-23^oC=-4^oC

Q=mc\Delta T=60 g\times 4.15 J\g ^oC\times (-4^oC)=-996 Joules

Negative sigh indicates that energy was given by the water to the reaction.

The energy absorbed by the reaction from the water is 996 Joules.

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