Answer:
The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet Earth and forming its planetary atmosphere
The old style (incandescent) light bulb converts more energy
into heat than it does into light. If you're using it mainly as a
source of light, then it's a bummer, and its efficiency is very low.
BUT ... if you're using an incandescent light bulb as a heater, then
its efficiency is much better. It all depends on your point of view.
Answer:
Explanation:
Work function of aluminium is 4.1 eV .
Therefor light of minimum energy of 4.1 eV will be required to cause the emission of electrons.
If we use this frequency of light or energy of light to effect ejection of photoelectrons from cesium , it will be easily ejected because energy requirement for this metal is lower ( work function is lower 2.1 eV ). than the energy of photon falling on it.
If we use this frequency of light or energy of light to effect ejection of photoelectrons from aluminium , it will be not ejected because energy requirement for this metal is high ( work function is higher 5.1 eV ) . Even if we increase the intensity of light , electrons will not be ejected because energy of each photon depends upon the frequency .