Question

Question 1 What is the wavelength of an electromagnetic wave of frequency 98.4-MH7 Quiz navigation Not yet answered Marked out of 1.00 r Flag question Answer Finish attempt... Time left 0:19:47 Question 2 Suppose you have visible light whöse wavelength in vacuum is 450nm. If the light travels through glass, what happens to the wavelength of the light? Select one: O A Wavelength increases O B. Wavelength decreases Not yet answered Marked out of 1.00 P Flag C. Wavelength stays the same D. I don't know because I didn't read the text ome distance away, as series Question 3 two slits and then lands on a scree When light passes through

Answer 1

1.f=98.4MHz=98.4x10⁶Hz

the electromagnetic wave travells at the speed of light(c)

c=3x10⁸m/sec

c=wavelength x frequency

Wavelength=c/f=3x10⁸/98.4x10⁶=3.0487=3.05meterAns

2.Acoording to Snell's law-

sin$\theta$₁/sin$\theta$₂=v_{​​​​​​1}​​​​​/v_​​​2 =n_​​2/n_​​​​1

where v_{​​​​​​1} is velocity of wave in vacuum.

v2 is velocity of wave in glass.

n1 is refractive index of vacuum=1

n2 is refractive index of glass=n>1

c/v2=n/1

v2=c/n

frequency of light is same in different mediums.

V =$\lambda$f

$\lambda$₂f=$\lambda$₁f/n

$\lambda$₂=$\lambda$_1/n​​​​

n>1

so $\lambda$₂<$\lambda$​​​​​​₁

_{so wavelength of light is decreased in glass.Ans}

_{​​​​​​}