Radiation

Explain how to adjust the count to give the correct count of a radioactive sample

• add the background count to the sample count

• multiply the sample count by the background count

• divide the sample count by the background count

• subtract the background count from the sample count

A sample of a radioactive rock gives a count of 138. If the average background count is 27, calculate the count rate of the sample

• 165

• 3726

• 5

• 111

Tags

NGSS.HS-PS1-8

A student measures the background count three times and gets these readings 20, 23 and 26 counts per second. Which of these is the correct average count?

• 3

• 22

• 23

• 51

Which of these best describes why radon is a dangerous radioactive gas

• it can be breathed in and out

• it can be breathed in and it can mutate DNA

• it mutates all cells

• It can be breathed in and it can go the the brain

A sample of rock gives a count per second of 280. Why is this not a correct measure of the radioactivity of the rock

• it is too high for any rock

• It also includes the cosmic rays

• it also contains the background count

• they have removed the background count

All radiation is harmful to life. Is this statement true or false?

• true

• false

Tags

NGSS.HS-PS4-4

Heat we feel from the sun

• conduction

• convection

• radiation

Tags

NGSS.MS-ESS2-6

The heat you feel when you put your hands ABOVE a fire.

• conduction

• convection

• radiation

The heat my snake feels from the heat lamp above him.

• conduction

• convection

• radiation

Heat you feel when you sit next to a campfire.

• conduction

• convection

• radiation