48.54
a student is performing an experiment comparing sound
and light waves. the student gathers the following data
what conclusion does the student most likely make based
on this data?
02
medium
speed of sound
temperature
(°c)
ice
water
steam
speed of
sound (m/s)
3200 m/s
1500 m/s
346 m/s
25
100
light waves always travel the same speed, however, the
speed of sound is determined by the medium that it
travels through
all sound waves always have the same energy, so the
temperature of the medium does not affect wave speed
light needs to vibrate particles, so it travels fastest in
tightly packed solids, while sound does not need a
medium, so it travels fastest in a gas
tightly packed particles in solids slow down the light
waves, however, sound waves make particles bounce
into each other, so they travel faster in solids.
medium
speed of light
index of
refraction
1.00
speed of light
(mis)
air
water
glass
133
2.99 x 10
226 x 10
1 91 x 10
1.57
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newton's first law of motion

  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

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat

we're given that v₀ = 0 and a = 5.4 m/s². therefore, since v = at + v₀ for constant acceleration the equation for velocity is

after 28s,

m/s

which i would round to 150 m/s as my final answer