Use the formula below where L is loudness measured in decibels, I is intensity of sound, and I0 is the lowest-intensity sound that the average human ear can detect. L=10logII0 . Suppose the sound intensity of a fan must be reduced by one third. By how many decibels would the loudness be decreased? Hint: Let I1 = present intensity, I2 = reduced intensity, L1 = present loudness, and L2 = reduced loudness. A. about 1.76 dB B. about 2.24 dB C. about 0.25 dB D. about 1.35 dB

statement #3 on andre"s list is false.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.