Question

an earthquake sends seismic waves outward from the epicenter. the waves travel through different media in different directions. what will be true for all people who feel the earth shaking? (1 point)
the amplitude of the shaking will be the same for all observers.
the seismic waves will travel outward at the same speed in all directions.
the seismic waves will be equally far apart for all observers.
the earth will rise and fall with the same frequency.

Explanation:

1. Analyze the first option: Amplitude of shaking depends on distance from epicenter, medium, etc., so it's not the same for all observers.
2. Analyze the second option: Seismic wave speed depends on the medium (e.g., different speeds in solid, liquid, gas layers of Earth), so speed isn't same in all directions.
3. Analyze the third option: Wave spacing (wavelength) can change with medium and speed, so not equally far apart for all.
4. Analyze the fourth option: Frequency of a wave is determined by the source (the earthquake here) and doesn't change as it travels through different media (assuming no Doppler effect from moving source/observers, and for seismic waves, frequency is inherent to the earthquake's vibrations). So the earth's rising and falling (due to the wave) will have the same frequency for all observers.

Answer:

The earth will rise and fall with the same frequency.