Awave is approaching a barrier that has a small hole at the center. which describes the change in the wave as it encounters the barrier?

a. the wave will slow down

b. the wave will bend or defract

c. the wave will bounce in the opposite direction, or reflact.

d. the wave will increase its speed

The correct answer is "The wave will bend or defract".

Explanation:

Diffraction: It is the phenomenon in which the light gets bend around the corner of the aperture or a slit. There is a spreading of the waves as they pass through an aperture.

The wavelength of the wave is comparable or greater than the size of the aperture to observe diffraction. If the wavelength of the wave is not comparable or greater than the size of the aperture then in this case, the diffraction is unnoticeable.

In the given problem, a wave is approaching a barrier that has a small hole at the center. A small hole is aperture here. The wave will bend or defract. The diffraction phenomenon will occur in this case.

Therefore, the correct option is (B).

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide