Aluminum has a frequency threshold of 9.846 × 1014 hz. which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum? electrons will be ejected immediately. no electrons will be ejected. electrons will start being ejected several seconds after the light strikes the aluminum. no electrons will be ejected unless the intensity is very high

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

What information does a complete ionic equation give that the balanced equation doesn’t show?