Question

wavelength associated with a light wave whose frequency is equal to 4×10^9Hz​

Answer 1

Answer:

Explanation:

(i) The frequency of the light wave is

 

period

1

​  

=  

2.0×10  

−10

s

1

​  

=5×10  

9

/s.

(ii) The wavelength of light wave is

 

ν

c

​  

=  

5×10  

9

/s

3×10  

8

m/s

​  

=6.0×10  

−2

m.

(iii) The wave number of light wave is  

ν

ˉ

=  

λ

1

​  

=  

6.0×10  

−2

 

1

​  

=16.66/m.

Answer 2

Answer:

0.075m

Explanation:

Velocity=distance/time

=Wavelength*frequency

Velocity=3*10^8m/s

Frequency=4*10^9Hz

Wavelength=(3*10^8)/(4*10^9)

= 0.075m

Hope it helps you