Question

A wave travels at 330m/s^-1. the wavelength is found to be 2.4m.
Calculate the period of oscillation of a article in the medium transmitting the waves.
The frequency of oscillations of the source transmitting the wave

Answer 1

Answer:

Let the no be 10x+y

Y is in ones place and x is in tens place According to question the digit in its ones place is twice that of the no which is in tens

place

So x=2y

If 9 is added to the no then the new no is

10x+y +9

And the digits of sum obtained is reversed

So,

10x+y+9 = 10y + x

10x2y+ y + 9 = 10y + 2y

21y+9 = 12y

21y-12y = -9 9y = -9Y = -1

X= 2y

X= -2

The number is 10x+y

10x-2+-1 = -21

Answer 2

Answer:

thank you for providing answer