Final answer:
There is no information provided about a course taught by Dr. George R Carruthers. However, Dr. Samuel Ling has taught introductory and advanced physics at Truman State University and has contributed significantly to the field of Physics Education.
Step-by-step explanation:
The information provided does not contain any details regarding a course taught by Dr. George R Carruthers for D.C. Public Schools Science teachers. However, it mentions Dr. Samuel Ling, who has extensive experience in teaching both introductory and advanced physics at Truman State University. With two PhDs in Chemistry and Physics, Dr. Ling's expertise is evident in his publication 'A First Course in Vibrations and Waves' and his research in Physics Education. Although Dr. Ling's accomplishments are well-noted, they do not pertain to the specific query about Dr. George R Carruthers.