Question

I don't know how to solve it plz solve it fast and don't concentrate on marked answer it may be wrong​

Answer 1

answer of this is 875Hz

Answer 2

Answer:

If you read care fully and step by step you will never get problem in these kind of questions .

Explanation:

Do you know what frequency is !

Okay it is 1 upon time period

Do you know what frequency is !

Okay it is 1 upon time period

Now what is time period of wave

It is time in wave complete one cycle

Or time in which wave travels lambda

Now when we will say a round is complete

Now when we will say a round is completeWhen the graph starts to repeat

Now when we will say a round is complete

When the graph starts to repeat

Now see the diagram graph starts to repeat when it second time comes to zero .

The distance he travels ( x axis distance ) it calls wavelength (symbol lemda) .

time = distance / velocity

So lemda upon v is t . and 1/t is our frequency.

Now count how many lambda are equal to 110

if you count it is 2 and then 3/4

so

$2 + \frac{3}{4} = \frac{11 \lambda}{4} = 110 \\ \lambda = 40$

So

$t = \frac{ \lambda}{v} = \frac{0.4}{350} \\ f = \frac{1}{t} = \frac{3500}{4} = 875hz$