Which of the following did christian doppler explain? a. atmospheric changes that affect climate b. the transfer of electricity through solids c. the changing colors of binary stars d. the radioactivity of certain elements

The correct option is c

Explanation:

Christian Doppler is known for his principles in waves known as the doppler effect. This principle states that the change in frequency of a wave is caused by the distance between the source (of the wave) and the observer of the wave. He then proceeded to explain the concept of changing colors of binary stars with this principle.

  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

true tan speed = ang vel x radius