Answer: The threshold energy of the electrons in aluminium is 393.71 kJ/mol.
Explanation: Threshold energy is the minimum amount of energy which is required to emit a photon from a metal surface.
Mathematically,
Where,
E = Threshold energy
= Avogadro's constant = 
h = Planck's Constant = 
= Frequency of the particle =
Putting values in above equation, we get:
(Conversion Factor: 1kJ = 1000J)
Answer:
reduce your risk of a heart attack.
manage your weight better.
have a lower blood cholesterol level.
lower the risk of type 2 diabetes and some cancers.
have lower blood pressure.
have stronger bones, muscles and joints and lower risk of developing osteoporosis.
It is a scaler because it’s only fully describes by a magnitude and a numerical alone
Answer:
C. seismographs
Explanation:
Theirs another name for seismographs but c is correct
270/70^2 = x/80^2
Cross multiply
270 (6400) = 4900x
x = 270(6400)/4900
352 and 32/49 feet
Hope this helps
