Radiation with frequency of a 1.85 MHz, falls in the radio wave region. What is the wavelength (in nm) of the electromagnetic radio?

λ  =  1.62×10¹¹ nm

Explanation:

Wavelength of radiation = ?

Frequency of radiation  = 1.85 MHz (1.85 ×10⁶ Hz)

Solution:

Formula:

Speed of radiation = frequency × wavelength

c = speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s  = 1.85 ×10⁶ Hz ×  λ

λ  =  3×10⁸ m/s   / 1.85 ×10⁶ s⁻¹

λ  =  1.62×10² m

In nm:

1 m = 10⁺⁹ nm

λ  =  1.62×10¹¹ nm

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.