2024 Fall Semester Exam

Front

How is energy transported in a sound wave?

Back

Energy is transported in a sound wave by a sequence of collisions between molecules in the material.

Front

Does a star with a surface temperature of 5,000 K have a longer or shorter lifespan than our sun?

Back

Longer, because it has a lower temperature.

Front

What happens to the gravitational force if I quadruple the distance and quadruple the mass of one object?

Back

The gravitational force becomes 1/4 as much.

Front

What happens to the speed of a wave if the frequency decreases in the same medium?

Back

The speed does not change.

Front

What does the photoelectric effect suggest about the nature of light?

Back

Light should be treated as a particle, because energy did not depend on amplitude.

Front

Define sound wave.

Back

A sound wave is a type of mechanical wave that propagates through a medium (solid, liquid, or gas) due to the vibration of particles.

Front

What is the relationship between temperature and the lifespan of a star?

Back

Generally, stars with lower temperatures have longer lifespans than those with higher temperatures.

Front

Explain the concept of gravitational force.

Back

Gravitational force is the attraction between two masses, which depends on the mass of the objects and the distance between them.

Front

What is the formula for gravitational force?

Back

F = G * (m1 * m2) / r^2, where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses, and r is the distance between the centers of the two masses.

Front

What is the effect of frequency on wave speed in a given medium?

Back

In a given medium, the speed of a wave is constant regardless of its frequency.