15.Radar detectors use radio waves to measure the speed of moving vehicles Radar detectors have a wavelength of 1.8 meters. What is the frequency of
waves from a radar detector?
A 3.7 X 10^-34 Hz
B 6.0 X 10^-9 Hz
C 5.4 X 10^8 Hz
D 1.7 X 10^8 Hz

Option D:1.7 × 10^(8) Hz

Explanation:

We are given wavelength; λ = 1.8 m

To find the frequency, we will us the formula; v = fλ

Thus; f = v/λ

Where v is speed of light = 3 × 10^(8) m/s

Thus;

f = (3 × 10^(8))/1.8

f = 1.7 × 10^(8) Hz

So correct answer is Option D

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

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