Question

1.The question below refers to the following graph.

What is the approximate period of this wave?

15 centimeters
15 seconds
10 seconds
5 seconds
2. The question below refers to the following graph.



What is the wavelength of this wave?

10 cm
15 cm
60 cm
cannot be determined
3. The question below refers to the following graph.



What is the frequency of this wave?

1 wave/sec
10 waves/sec
0.1 wave/sec
cannot be determined

Answer 1

1. 10sec

2. Can not be determined

3. 0.1wave/sec

Answer 2

(1) T = 10 seconds

(2) Wavelength cannot be determined.

(3) Frequency,
`\\u=0.1\ waves/sec`

Explanation :

(1) From the given graph :

Time period of the wave is defined as the time taken by it to complete one cycle.

So, the period of this wave is (C) " 10 seconds".

(2) The distance between two consecutive crest or the trough is called the wavelength of the wave.

From the graph it is clear that the distance between two consecutive crests is 10 cm(see attached figure).

So, the correct option is (a) "10 cm".

(3) As the time period of the wave is 10 seconds.

So,
`f=(1)/(T)`

`f=(1)/(10\ s)\ waves/sec`

`f=0.1\ waves/sec`

So, the correct option is (c) " 0.1 wave/sec ".