Question

A teacher stands well back from an outside doorway​

Answer 1

Explanation:

A teacher stands well back from an outside doorway

0.80

m

wide, and blows a whistle of frequency

760

H

z

. Ignoring reflections, estimate at what angle it is not possible to hear the whistle clearly on the playground outside the doorway. Use

343

m

/

s

as the speed of sound.