The lifetime of a star is determined by its mass. The larger it’s mass, the shorter it’s lifetime
The second one is the answer
Answer:
True
Explanation:
The photoelectric effect can be classified that the photon or electron emission from the atom surface when certain amount or can say that the incident particle hit by some threshold energy to the surface.
This incident particle will change the kinetic energy change of the ejected photon.
So, by the above discussion we know that work energy is change in the kinetic energy and there is also change in kinetic energy occur in the process. So, work energy can be say that the amount of threshold energy to dislodge or eject a photon from the atom.
Answer:
Gold is metallic, with a yellow color when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength.
Formula --
Molecular Weight (lb/m o l) 28.96
Critical Temp. (°F) N/A
Critical Pressure (p s i a) N/A
Boiling Point (°F) -317.8
Melting Point (°F) N/A
Psat 70°F (p s i a) (note 1)
Explanation: