Two in phase coherent sources emitting harmonic waves of wavelength are separated by a distance d.
What is the minimum non-zero value of d for which constructive interference occurs everywhere along the line that passes through the locations of the two sources? A)
/4
B)
C)
2
D)
/2
E)
4
Question 2
If an all electric house uses 2400 kWh in a month, what will the amount of the bill for electricity be at a rate of 9.5 cents per kWh?
A)
23
B)
2280
C)
228
D)
25,300
E)
11.50