Question 12 would be: C
question 13 would be: B
Answer:
wavelength = 0.8989 m
Explanation:
Given data:
weight of wire is 8.25 g
length of wire is 65 cm
speed of sound in room is 344 m/s
time of returning of pulse is 7.84 ms
There are three time period
Time period 
velocity = wavelength × frequency
wavelength 
wavelength = 0.8989 m
One percent annual chance of flooding does not mean it will happen with absolute certainty once every 100 years. Just that the expected value of a flood in 100 years is one.
As an example, heads has a 50% chance of happening every coin flip. With 2 coin flips, the expected value is one. However, it would be a misnomer to call "heads" a 2-flip outcome.
Answer:
PE = mgh
Explanation:
m is mass, g is gravitational constant (9.81) and h is height
The answer is C, A CD-ROM is a compact disk that contains stored
information that can be read on a computer. which can be used and store
for a long time. A CD-ROM store data in digital format. data is written
from a laser light on the disk. Minimum capacity this drive is around
700 MB.
