Question

In the curve as shown in figure half the wavelength is :
A. A B
B. B D
C. D E
D. A E

Answer 1

The wavelength is the distance between the two points in a wave and it is denoted with the symbol lambda $\lambda$, as we know that the sounds are represented in the form of waves in the air, they are lengths of the two particular similar points so the sounds are represent with the wavelengths and the frequency is the number of waves at produced in a particular time.

Complete step by step answer:
Given:
The points in the above figure represents each point.
According to the given wavelength, the points B, F are called as the crests and the point at D and H are called as the troughs. The crest is the maximum or peak displacement of the wave upward direction, and the trough is the minimum displacement in downward direction.
Now, the distance between the points B and F, D and H are the wavelengths, it means the distance between any two crests and two troughs are called the wavelength.
So the half of the wavelength is defined as the half the distance between B and D or D and F.
According to the given options the distance between B and D is the half wavelength.

So, the correct answer is “Option B”.

Note:
While representing the wavelengths we should get confused, the wavelengths are the distance between two points (the points may be crests and troughs) and the half of the length is the distance between the crest to trough or trough to the crest. We should be clear about the concept while answering.