Question

The frequency $1057MHz$ of radiation arising from two close energy levels in hydrogen belongs to

• A. radio waves
• B. infrared waves
• C. microwaves
• D. γ – rays

Answer 1

The correct option is A

radio waves

The explanation for the correct answer.

In case of option A:

1. In the electromagnetic spectrum, radio waves have the longest wavelengths.
2. Radio waves have a frequency of $1057MHz$ that result from two near hydrogen energy levels.

The explanation for the incorrect answer.

In case of option B:

The wavelength range of infrared (IR) is between 780 nm and 1 mm, while its frequency range is between $300GHzand400THz$.

In case of option C:

1. Microwave wavelengths range from $30to0.03cm$at frequencies between $109Hz(1GHz)and1000GHz$.
2. There are several communication systems applications in this spectral domain that are significant in both the military and civilian fields.

In case of option D:

1. The quickest brain waves are gamma waves. They mostly happen when you're really aware and awake.
2. They span the $30to80Hertz$ frequency.

Hence, option A is the correct answer.