Answer
given,
distance between A and B is equal to 5 m
let x be the distance of loud speaker from the source A
For constructive interference, path difference = mλ
x - (5 - x ) = 0 , for m = 0
2 x - 5 = 0
2 x = 5
x = 2.5 cm
For destructive interference

m = 0



x = 4 , 1 cm
Atoms from two different elements may have the same number of neutrons, but never the same number of protons
They remap things and check what changes happened.
Answer: 0.321 seconds
Explanation:
Let assume that air has a temperature of 20 °C. Sound speed at given temperature is
. As sound spreads at constant speed, time can be easily found by using this formula:


