JAMB Physics Past Questions & Answers - Page 143

712.

In a resonance tube experiment, which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore?

A.

128HZ

B.

256HZ

C.

512HZ

D.

768HZ

E.

1024HZ

Correct answer is C

for close pipes, the frequency is given as F=nv/4l while for opened pipes it is f=nv/2l

the number of harmonics,n is 1. Which is the fundamental note.

f=1 X 327.68 /4 X 0.16

f=327.68/0.64

f=512HZ

715.

The diagram shows lens arrangement in

A.

A Compound Microscope

B.

astronomical telescope

C.

binocular

D.

periscope

E.

projection lantern

Correct answer is B

No explanation has been provided for this answer.