2025 RHS TEST CH 38 1-8

Who is credited with the first practical use of radiographs in dentistry, in 1896.

• C. Edmund Kells

• Otto Walkoff

• Wilhelm Roentgen

Energy is defined as

• the capacity to do work.

• anything that occupies space.

• anything that has form or shape.

Matter is anything that

• is alive and breathes oxygen.

• that is important.

• occupies space and has form or shape.

Dental x-rays cannot make atoms radioactive.

• True

• False

Electrons travel around the nucleus of an atom in well-defined paths known as

• gravity

• shells

• solar systems

A minute (tiny) bundle of pure energy that has no weight or mass

• photon

• ion

• proton

Which of the following describes ionization?

• an atom without a nucleus

• an atom that loses an electron

• an atom with equal numbers of protons and electrons

X-rays are a form of energy that can ___________ matter.

• penetrate

• move

• reflect

X-rays belong to a group called ______________ radiation.

• electromagnetic

• gamma

• medical

Electromagnetic radiation is made up of photons that travel through space at the speed of __________.

• light

• sound

• both a and b are correct