Two guitars are playing together producing a beat frequency. the first guitar is playing at a frequency of 867 hz and the beat is produced every 0.04 seconds. what are some possible frequencies the other guitar could be playing to make this beat?
a. 875 hz or 860 hz
b. 904 hz or 830 hz
c. 878 hz or 856 hz
d. 892 hz or 842 hz

The correct option is D. 892 Hz or 842 Hz

Explanation:

The beat frequency refers to the rate at which the volume is heard to be oscillating from high to low volume.

It is found as the difference of the two frequencies.

If are the two frequencies ,then the beat frequency is

=     -------------(1)

Given ,  

Frequency =

=

= 25 Hz

Substituting value of beat frequency in (1) ,

= 867 +25 = 892 Hz

                         OR

= 867 - 25 = 842 Hz

The correct option is D. 892 Hz or 842 Hz

  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

b.

hope this : )