The standard unit of radiation related to biologic hazard is the:

A. curie

B. roentgen

C. neutrino

D. bequerel

Which is more common: a star blows up as a supernova, or a star forms a planetary nebula/white dwarf system?

Which of the following equations correctly expresses the relation between vectors A⃗, B⃗, C⃗, and D⃗ shown in the figure?

According to the theory of plate tectonics, the A. asthenosphere is divided into plates. B. lithosphere is divided into plates. C. asthenosphere moves over the lithosphere. D. asthenosphere is strong and rigid.

Explain what happens to each ball after the collision. Why do you think this occurs? Which of Newton's laws does this represent?

Which of the following best defines volume? the amount of matter in a substance the shape of a sample of matter the amount of space that a sample of matter takes up the way that a substances atoms are arranged Wood is considered a good insulator

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

What causes the stars to appear to move across the night sky?

Two waves collide and the temporary combined waves that results is smaller that the original wave. which term describes this interaction? A. destructive interference B. standing wave formation C. diffraction D. constructive interference