What is the frequency of an x - ray if the wavelength is 4.5 E - 10m?

What has happened to scientists' estimate of the world's age over time? a) They have become increasingly uncertain as to the age of the earth b) their thoughts about the age of the earth has remained unchanged c) they think the Earth is much younger

How did J. J. Thomson's discovery affect the model of the atom? A. It proposed that the positive charge was concentrated in the nucleus. B. It proposed that electrons orbit the nucleus like the planets in the solar system. C.

1. Explain the three states of matter. Use water as an example.

Urban heat islands affect local air current and weather conditions including: 1) increased number of thunderstorms over cities in summer months 2) lingering dust domes over cities 3) stronger natural disasters such as earthquakes and hurricanes 4)

The acceleration means that for each second that passes, falling objects move 9.8 meters. A. True B. False

How much force is needed to accelerate an object of mass 90 kg at a rate of 1.2 m/s2? 0.013 N 75 N 108 N 1080 N

No work is done on an object when a force acting on the object does not move it. True False

wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes through a diffraction grating that has 250.0 lines per mm

If a fully loaded shopping cart has a head-on collision with an empty cart both moving at the same speed toward each other, which cart experiences the greater force? The greater impulse? The greater change in momentum? The greater acceleration?

Why didn't early Portuguese and Dutch explorers decide to create settlements in Australia