Question

Plz tell me the answer of the 13th question .

Answer 1

(I)

firstly , we will find maximum and minimum y-value

we can see that

maximum value is 5

minimum value is -5

so, we can find amplitude

$A=\frac{5-(-5)}{2}$

$A=5$..........Answer

(II)

we know that

wave length is the length of one wave

we can see that from B to F , there is one wave

and we are given it's length as 20cm

so, wavelength is 20cm......Answer

(III)

we know that

$velocity=wavelength*frquency$

we are given

frequency =100hz

wavelength =20cm

now, we can find velocity

$velocity=20*100cm/sec$

$velocity=2000cm/sec$............Answer