A source produces 20 crests and 20 troughs in 4 seconds. The second crest is 3 cm away from the first crest. Calculate : i. Wavelength [ Ans : 3 × m ]
ii. Frequency [ Ans : 5 Hz ]
iii. Wave speed [ Ans : 1.5 × ]

Show your workings !
*Irrelevant / Random answers will be reported!

Solution given:

No of waves[N] =20crests & 20 troughs

=20waves

Time[T]=4seconds

distance[d]=3cm=0.03m

Now

Wave length=3cm=3 ×

Frequency=

==5Hertz

and

Wave speed:wave length×frequency=3 × ×5=1.5 × .

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14