Question

If the frequency of an emitted light is 200 Hz. The time period is:

(A) 100 sec                    

(B) 20 sec                   

(C) 0.02 sec                            

(D) None of these​

Answer 1

Answer:

Wavelength of light is 2.1 m

Solution

Wavelength : Wavelength is distance b/w two successive throughs of a wave.

Wavelength is given by,

✪ Wavelength = Speed/Frequency

Now we have,

Speed of light = 440 m/s

Frequency = 210 Hz

Wavelength = ?

Using the same formula :

✪ Wavelength = Speed/Frequency

⇒ Wavelength = 440/210

⇒ Wavelength = 2.1 m

So to say,

∴ Wavelength of light = 2.1 m

Answer 2

Answer:

option is (C) 0.02 sec

Explanation:

Formula:- n=1/T

200=1/T

T=1/200

T=0.02 sec