What is the wavelength of a light of frequency 7.21 % 1014 Hz?

λ = 0.416×10³ nm

Explanation:

Given data:

Frequency of light = 7.21×10¹⁴ Hz

Wavelength of light = ?

Solution:

speed of light = wavelength × frequency

c = speed of wave = 3×10⁸ m/s

by putting values

3×10⁸ m/s = λ×  7.21×10¹⁴ Hz

λ =  3×10⁸ m/s /  7.21×10¹⁴ Hz

λ = 0.416 ×10⁻⁶ m

λ = 0.416×10⁻⁶ ×10⁹ nm

λ = 0.416×10³ nm

answer; /// i do believe that the correct answer is (a) boiling

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6