Simple noise-transmitting device
Velocity of sound.
The speed of sound depends upon the type of medium transmitting the sound. Liquids transmit sound waves faster than gases, and solids usually transmit sound waves faster than either liquids or gases. The speed of sound in air is 1088 feet per second at 32° F. while at 70° F. the speed increases to 1130 feet per second. The latter represents a speed of 770 miles per hour.
Velocity of sound.
The speed of sound depends upon the type of medium transmitting the sound. Liquids transmit sound waves faster than gases, and solids usually transmit sound waves faster than either liquids or gases. The speed of sound in air is 1088 feet per second at 32° F. while at 70° F. the speed increases to 1130 feet per second. The latter represents a speed of 770 miles per hour.
VISUAL FLOW
Avoid Distracting Mannerisms A rule to remember is that instructors should avoid those things which cause the class to concentrate upon the instructor's mannerism rather than on the subject matter. Instructors may not be aware of their peculiar mannerisms…
Be Enthusiastic
There is no substitute for a physically vital and enthusiastic delivery (fig. 18). Enthusiasm is contagious. The instructor will find that, if he is sold on his subject and conveys this feeling to the class, he will keep his students interested and eager to learn. Instructors who have a dull, unanimated delivery will lose the attention of their classes.
There is no substitute for a physically vital and enthusiastic delivery (fig. 18). Enthusiasm is contagious. The instructor will find that, if he is sold on his subject and conveys this feeling to the class, he will keep his students interested and eager to learn. Instructors who have a dull, unanimated delivery will lose the attention of their classes.
VISUAL FLOW
“Useful Tips”, Soviet book from 1959
Soviet Children’s Magazine «Bonfire». Number 3. 1936 /
*Детский журнал «Костер». №3. 1936 год.
*Детский журнал «Костер». №3. 1936 год.