To fully describe the photoelectric effect, scientists must consider which of the following to be quantized?
A. Matter only
B. Neither light nor matter
C. Both light and matter
D. Light only

D. Light only

Explanation:

This is because photoelectric effect is a phenomenon in which electrically charged particles are emitted from a material when light is incident on it.

The light generates the energy which causes the material to emit electrons.

These electrons are only emitted at certain values of light energy, this thus shows that the light has to be quantized since electrons are not emitted over a range of values of light energy.

Thus, to fully describe the photoelectric effect, only light needs to be quantized.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

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