Henri draws a wave that has a 4 cm distance between the midpoint and the trough. geri draws a wave that has an 8 cm vertical distance from the bottom of the trough to the top of the crest.

which statement best describes the energy in henri and geri’s waves?

henri’s wave has a higher amplitude and more energy.
henri’s wave and geri’s wave have the same amplitude and the same energy.
henri’s wave and geri’s wave have the same amplitude, but geri’s has more energy.
geri’s wave has a higher amplitude and more energy.

Answer : Henri’s wave and Geri’s wave have the same amplitude and the same energy.

Explanation :

It is given that,

Henri draws a wave that has a 4 cm distance between the midpoint and the trough (fig).

Geri draws a wave that has an 8 cm vertical distance from the bottom of the trough to the top of the crest (fig).  

So from the figure, it is clear that the amplitude of both Henri's and Geri's waves are same i.e. 4 cm.

Energy of the wave depends on the amplitude of the wave. So, Both wave has the same energy.

So, the correct option is (b) "Henri’s wave and Geri’s wave have the same amplitude and the same energy".

  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

well clustered together.

points close on a scatter diagram