What is the sound intensity level in decibels of ultrasound of intensity 7.53 ✕ 104 w/m2, used to pulverize tissue during surgery?

Answer : The intensity of sound level in decibels is, 169 dB

Explanation:

The expression used for the intensity of sound level is given by the equation:

where,

I = final intensity =

= initial intensity = threshold intensity of human hearing =

Now put all the given values in the above formula, we get:

Thus, the intensity of sound level in decibels is, 169 dB

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.