Science 21-25

Stars are most similar to

• heaters

• nuclear reactors

• car engines

• gas stoves

Tags

NGSS.HS-ESS1-1

Parallax is a method used to measure

• distances to stars

• temperatures of stars

• rotation speeds of stars

• sizes of stars

Which of the following units is the standard unit of measure for stellar parallax?

• arc second

• parsecs

• degrees

• radians

Which of the following stars is closest to earth?

• Betelgeuse

• Polaris

• Proxima Centauri

• Sirius

Which of the following substances is NOT an element?

• mercury

• iron

• copper

• water

The smallest unit of matter is a(n)

• atom

• molecule

• substance

• compound

Tags

NGSS.MS-PS1-1

The Bohr model introduced the concept of electrons as

• occupying discrete energy levels

• negatively charged particles

• particles orbiting the nucleus

• particles omitted during radiation

Which of the following characteristics can be used as an atomic fingerprint to identify elements experimentally?

• orbital size

• emission lines

• atomic mass

• number of electrons

Photons are packets of radiation that possess

• no momentum

• no mass

• quantized energy level

• particle-wave duality

Tags

NGSS.HS-PS4-3

Which atom is LEAST likely to have a complicated emission spectrum?

• hydrogen (atomic number 1)

• argon (atomic number 18)

• carbon (atomic number 6)

• gold (atomic number 79)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2