A Certain Crystal Has a Spacing of 0

question 2

Multiple Choice

A certain crystal has a spacing of 0.442 nm between atoms. A beam of neutrons moving with a speed of 1640 m/s perpendicular to the surface is diffracted as it passes through the crystal. What is the angle from the central maximum to the next interference maximum? (m_neutron = 1.675 × 10^-27 kg, h = 6.626 × 10^-34 J ∙ s)

• A) 17.0°
• B) 21.0°
• C) 33.1°
• D) 60.0°
• E) 90.0°

Explain the role of ATP in muscle contraction and relaxation.

Distinguish between slow-twitch and fast-twitch muscle fibers and their functionalities.

Understand the role of the sarcoplasmic reticulum and T tubules in muscle function.

Describe regulatory proteins and their action in muscle contraction.