What is the mass number of an atom that has 12 neutrons and 11 protons?

24

23

12

What do radio waves and microwaves have in common

Iron has a known density of 7.9g/ml. If a sample of Iron has a mass of 84.5 grams, how many millimeters of water will the sample displace?

Explain what parallel medium boundaries do to the path of the wave after it travels through both boundaries. (air and water)

the color of the sun appears to be orange or yellow when looking from the earth but it really is red. true or false

There are 8 elements that together make up 98.5% of earth crust oxygen 46.6% aluminum 8.1% iron 5.0% calcium 3.6% sodium 2.8% potassium 2.6% magnesium 2.1% and silicon what percentage of earth crust is silicon

A long distance runner has an average speed of 4m/s during a race. How far does the runner travel in 20 minutes?

Density is calculated by dividing

The one island species evolved into three different species. This is called?

Find the components of vector M shown in figure 5-7

Electrical current is actually made of a. static charges. b. moving electrons. c. high or low voltage. d. resistance within a circuit.