Isaac physics waves

Green light has a wavelength of 0.00000050m, and a speed of 300000000m/s
When the green light goes into glass, it slows down. Its new speed is 200000000m/s. What is its frequency in glass?

Reply 1

Joinedup

Original post by Cliqueatthedisco

Green light has a wavelength of 0.00000050m, and a speed of 300000000m/s
When the green light goes into glass, it slows down. Its new speed is 200000000m/s. What is its frequency in glass?

'Trick' question... the frequency is the same in all media, but the wavelength changes when the speed does.

Reply 2

Physics Enemy

Original post by Cliqueatthedisco

Green light has a wavelength of 0.00000050m and a speed of 300000000 m/s.

When the green light goes into glass, it slows down, its new speed is 200000000 m/s.

What is its frequency in glass?

A wave's frequency is constant, regardless of e.g) travelling through air or refracting through glass.

So f (glass) = c (air) / λ (air)
= (3 x 10^8)/(5 x 10^ - 7)
= 0.6 x 10^15
= 6 x 10^14 Hz

Reply 3

Cliqueatthedisco

Original post by Joinedup

'Trick' question... the frequency is the same in all media, but the wavelength changes when the speed does.

OMG you just taught me what my teacher failed to teach and helped me soo much, thank you, I appreciate it!!

Reply 4

Cliqueatthedisco

Original post by physics enemy

a wave's frequency is constant, regardless of e.g) travelling through air or refracting through glass.

So f (glass) = c (air) / λ (air)
= (3 x 10^8)/(5 x 10^ - 7)
= 0.6 x 10^15
= 6 x 10^14 hz

thank you so much