Question

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

a 99db
b 23 db
c 57db
d 5db

Answer 1

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 :)

Answer 2

Level of sound is given by equation

`L = 10 Log (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(0.5)/(1)`

`L = -3.0 dB`

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