X rays

Question 1

What is an x ray?

Answer 1

X-rays are one type of electromagnetic radiation. They are commonly used in hospitals to produce photographs of bones which can be checked for breaks or fractures.

Question 2

What properties do x rays have?

Answer 2

they can penetrate less dense matter such as skin and body tissue (but not bone)

they have a range of frequencies (lower frequency X-rays have less energy and are therefore less penetrating and ionising)

they leave an image on photographic paper

Question 3

What is the inverse square law?

Answer 3

This scientific law states that the further the point source of radiation is from the point at which you are measuring it, the lower the dose.

If the distance is doubled, the intensity is reduced by four times (two squared). If the intensity is trebled, the intensity is reduced by nine times (three squared)

Question 4

What is a cathode?

Answer 4

A cathode is a wire filament that emits electrons when heated.

Question 5

What is an electron gun?

Answer 5

In thermionic emission the wire filament (cathode) is the electron gun?

Question 6

What is the equation for working out kinetic energy?

Answer 6

KE = ½mv2