You walk by a tube sticking out of the ground. You do not know if the bottom end

Question

You walk by a tube sticking out of the ground. You do not know if the bottom end of the tube is open or closed. However you are trained in voice and you find that there are standing waves in the pipe at frequencies of 91Hz, 104Hz, 117Hz, and 130Hz. There are no frequencies between these but there are frequencies above 130Hz and below 91Hz. On this day the speed of sound is 338m/s. State whether the bottom of the pipe is open or closed and explain your reasoning for your answer. No reason=zero credit, even for a correct answer. Find the length of the pipe

Which of these items continually emits electromagnetic radiation?

Item Circle one answer A burning log at 290 °C in a wood stove Yes No

An ice cube at (-)20 °C on your kitchen counter Yes No

An ice cube at (-)20 °C in a freezer at (-) 25 °C Yes No

A black cat in a completely dark room Yes No

Explanation / Answer

from the given data

the greatest common factor of the given values = 13
so, fundamental frequency = 13 Hz

and the pipe is an open pipe.

f = v/(2*L)

L = v(2*f)

= 338/(2*13)

= 13 m

1) Yes

2) Yes

3) Yes

4) Yeas

we know, if a body has more temperature than 0 K, it continuosly emit eletrimagnetic radiation.

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