Two coherent sources, a and b, emit light waves in a medium. the light waves superpose to produce an interference pattern. which of these is true of sources a and b? a) the two broad sources of light were far apart from each other. b) the waves emitted by the two sources have different wavelengths. eliminate c) the waves emitted by the two sources have constant phase difference. d) the two sources of light had to be obtained from two different sources.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

well we can't tell you because we cant see the time give a screen shot or something.