Extra Review For Unit 4 Test

Front

What determines the pitch of a sound?

Back

The pitch of a sound is determined by the number of vibrations produced per second.

Front

How do you calculate the total number of vibrations if a sound produces 2.62 x 10^2 vibrations per second for 5 x 10^-1 seconds?

Back

Multiply the number of vibrations per second by the time in seconds: 2.62 x 10^2 * 5 x 10^-1.

Front

What is scientific notation?

Back

Scientific notation is a way of expressing numbers as a product of a number between 1 and 10 and a power of 10.

Front

What are the two parts of scientific notation?

Back

The two parts are a coefficient (a number between 1 and 10) and a power of base 10.

Front

How do you divide numbers in scientific notation?

Back

Divide the coefficients and subtract the exponents of the powers of 10.

Front

What is the result of (6.9 x 10^7) / (2.3 x 10^-3)?

Back

3 x 10^10.

Front

If a class planted 7 x 10^5 trees and there are 3.5 x 10^3 students, how many trees did each student plant?

Back

Each student planted 2 x 10^2 trees.

Front

How do you find the smallest number among several in scientific notation?

Back

Compare the exponents first; if they are the same, compare the coefficients.

Front

Which is smaller: 1.3 x 10^20 or 8.4 x 10^19?

Back

8.4 x 10^19 is smaller.

Front

What operation would you use to find how many vibrations occur in a given time?

Back

Multiply.