In which of the following media would sound wave travel fastest?
wood
water
iron
mercury
Correct answer is C
No explanation has been provided for this answer.
27cm
24cm
9cm
6cm
Correct answer is D
Apparent depth = \(\frac{\text{thickness}}{\text{refractive index}}\)
= \(\frac{18}{1.5} = 12cm\)
Upward adjustment = 18 - 12
= 6cm
Which of the following distances is usually adjustable in the camera? The distance between the
lens and the film
diaphragm and the shutter
shutter and the film
diaphragm and the film
Correct answer is B
No explanation has been provided for this answer.
60o
50o
40o
30o
Correct answer is A
No explanation has been provided for this answer.
0.8Hz
5.0Hz
50.0Hz
80.0hz
Correct answer is D
f = \(\frac{v}{\pi} = \frac{20}{0.25} = 80Hz\)