Also visible light with a wavelength of 480nm appears

a violet
b green
c blue
d red

microwave have a wavelength and frequency than radio wave

a longer, higher
b longer, lower
c shorter, higher
d shorter, lower

need

a) The correct answer is

C blue

In fact, we see from the electromagnetic spectrum in the figure that light with wavelength of 480 nm corresponds to blue light.

b) The correct answer is

C shorter, higher

In fact, microwaves have wavelengths between 0.1 cm and 1.0 m, while radio waves can have wavelength of several metres, so microwaves have shorter wavelength than radio waves. Since the frequency of a wave is inversely proportional to its wavelength, this also means that microwaves have higher frequency than radio waves.

  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

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr