Understanding the Richter Scale and Earthquake Magnitude

The video tutorial explains how to measure the magnitude of an earthquake using the Richter scale, a logarithmic scale based on wave amplitude. It details the relationship between wave amplitude and earthquake magnitude, using a practical example to demonstrate the calculation process. The tutorial emphasizes the logarithmic nature of the Richter scale, where each level is ten times stronger than the previous one. By substituting given values into the Richter scale formula, the video shows how to calculate the magnitude of an earthquake, rounding the result to the nearest tenth.

What is the main problem discussed in the video?

• Finding the depth of the ocean

• Measuring the height of a building

• Determining the magnitude of an earthquake

• Calculating the speed of sound

What type of scale is the Richter scale?

• Arithmetic scale

• Linear scale

• Exponential scale

• Logarithmic scale

What instrument is used to detect earth movements?

• Seismograph

• Anemometer

• Thermometer

• Barometer

What does 'a sub zero' represent in the context of the Richter scale?

• The average wave amplitude

• The largest detectable wave

• The wave amplitude of a tsunami

• The smallest detectable wave

How is the magnitude of an earthquake calculated using the Richter scale formula?

• By subtracting the standard wave amplitude from the wave amplitude

• By multiplying the wave amplitude by 10

• By dividing the wave amplitude by the standard wave amplitude

• By adding the wave amplitude to the standard wave amplitude

What is the base of the logarithm used in the Richter scale?

• Base 2

• Base e

• Base 10

• Base 5

If an earthquake has a magnitude of 5, how much stronger is it compared to a magnitude 4 earthquake?

• 2 times stronger

• 5 times stronger

• 10 times stronger

• 20 times stronger

What is the wave amplitude of the earthquake in the problem?

• 50 times a sub zero

• 200 times a sub zero

• 584 times a sub zero

• 100 times a sub zero

What is the approximate magnitude of the earthquake calculated in the video?

• 3.5

• 4.2

• 2.8

• 5.0

Why do we round up the magnitude to 2.8?

• Because the hundredths place is 6

• Because the thousandths place is 9

• Because the units place is 8

• Because the tenths place is 5