An em wave has frequency 9.90×10^14 hz . what is its wavelength?
how would we classify it?

303.03 nm

ultraviolet region

Explanation:

f = frequency of the EM wave = 9.90 x 10¹⁴ Hz

λ = wavelength of the EM wave = ?

v = speed of EM wave = 3 x 10⁸ m/s

Using the equation

v = f λ

Inserting the values

3 x 10⁸ = (9.90 x 10¹⁴) λ

λ = 303.03 x 10⁻⁹ m

λ = 303.03 nm

The wavelength of the ultraviolet rays lies between 10-400 nm. hence the EM wave belongs to ultraviolet region

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explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.