How many nodal lines are created by two point sources emitting at the same wavelength λλ that are separated by a distance equal to 4.5λ4.5λ? Express your answer as an integer.

The number is  

Explanation:

From the question we are told that

   The distance of separation is  d =  4.5λ

Generally equation for nodal lines for two pint source is mathematically represented as

Here  m  is  2  represented number of point source

=>  

=>  

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.