Two speakers that are 11.0 m apart produce in-phase sound waves of frequency 270 Hz in a room where the speed of sound is 340 m/s. A woman starts out at the midpoint between the two speakers. The room's walls and ceiling are covered with absorbers to eliminate reflections, and she listens with only one ear for best precision. Required:
a. Why is this constructive interference?
b. She now walks slowly toward one of the speakers. How far from the center must she walk before she first hears the sound reach a minimum intensity?
c. How far from the center must she walk before she first hears the sound maximally enhanced?

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle