1st half term

What is an alpha radiation?

• An electron

• A neutron

• A helium nucleus

• An electromagnetic wave

What type of decay is shown here

²³⁸₉₂U ---> ²³⁴₉₀Th + ⁴₂He.

• alpha

• beta

• gamma

Which nuclear radiation is only stopped by thick lead?

• Gamma

• Beta

• Alpha

• Neutron

What makes something radioactive?

• elements with an atomic number above 81

• an unstable nucleus

• radioactive decay

• It decays over time

What is the charge on a beta particle?

• +1

• +2

• -1

• 0

Which radiation is most ionizing but least dangerous to humans when outside the human body?

• Gamma

• Alpha

• Beta

Which of these particles are found in the nucleus of an atom?

• Only protons

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

Which description best describes the nuclei of two isotopes of an element?

• The same number of protons and neutrons

• The same number of protons and electrons but different numbers of neutrons

• The same number of neutrons but different numbers of protons

• The same number of protons but different numbers of neutrons

How many protons and neutrons are in the nucleus of uranium-235?

• 92 protons, 143 neutrons

• 92 neutrons, 143 protons

• 92 protons, 235 neutrons

• 235 protons, 92 neutrons

When the temperature of matter decreases the particles ...

• speed up and move farther apart
• speed up and move closer together
• slow down and move farther apart
• slow down and move closer together

Tags

NGSS.MS-PS1-4