Question

1. momentum is (a) the push or pull that forces an object to change its speed or direction (b) the rate of change of velocity (c) the rate at which an object changes position (d) the tendency of an object to continue moving in the same direction 19. which colors light waves have the highest frequency? (a) yellow (b) green (c) red (d) violet 20. the major portion of an atoms mass consists of (a) neutrons and protons (b) electrons and protons (c) electrons and neutrons (d) neutrons and positrons

Explanation:

• For question 18: Momentum is the product of an object's mass and velocity, representing the tendency of an object in motion to continue moving. Option A describes force, option B describes acceleration, and option C describes velocity.
• For question 19: In the visible - light spectrum, violet light has the shortest wavelength and highest frequency, while red has the longest wavelength and lowest frequency.
• For question 20: Protons and neutrons are located in the nucleus of an atom and have relatively large masses compared to electrons. Electrons have very small masses, and positrons are antimatter counterparts of electrons and not a major part of a normal atom's mass.

Answer:

1. D. the tendency of an object to continue moving in the same direction
2. D. violet
3. A. neutrons and protons