Question

which of the following gives monochromatic light a.sodium lamp b.mercury lamp c.spark lamp d.all of the above​

Answer 1

Answer:

d All of the above

Explanation

All of them emit a single wavelength of light so all of the above us the answer.

Pls mark me as brainliest.

Answer 2

Answer:

d

Explanation:

all of them emit a single wave length of light so all of the aboves us the answer