Wave interference

1) Is a property of light
2) is a property of all waves.

I think the answer is number 1. Is this correct?

I have an equation that is 6.63/8.3=0.79. I have to use the correct number of significant digits and units for my answer. Would it be 7.9 or .079?

Yes, the correct answer is number 2. Wave interference is a property of all waves, not just light. It occurs when two or more waves meet and overlap, leading to a combination of their amplitudes and resulting in constructive or destructive interference.

As for your equation, when working with significant digits, you should generally follow the rule that the result of a calculation should have the same number of significant digits as the measurement with the fewest significant digits. In this case, the measurement with the fewest significant digits is "6.63" since it has three significant digits.

When dividing, the rule is to keep the same number of significant digits as the measurement with the fewest significant digits in the calculation. Since "8.3" has two significant digits, your answer should be rounded to two significant digits as well.

Performing the division, you get 0.79759036, but rounded to two significant digits, your answer should be "0.80" (rounded to the nearest hundredth).

So, the correct answer would be "0.80," not "7.9" or ".079".