• Best of luck to the class of 2024 for their HSC exams. You got this!
    Let us know your thoughts on the HSC exams here
  • YOU can help the next generation of students in the community!
    Share your trial papers and notes on our Notes & Resources page
MedVision ad

Physics Question: On Velocity-Wavelength- Frequency (1 Viewer)

theonly1

Member
Joined
Jul 2, 2013
Messages
76
Location
right behind you
Gender
Male
HSC
2014
hey,

recently i got a question from my teacher below and we seem to be coming to two different answers. Hopefully you may be able to shed some light on the issue. The question is

1) The velocity of red light with wavelength of 550nm and a period of 5.0 is?

My Working:

Since i need to find the velocity and i have the wavelength and can find the frequency i would use the formula V= f λ

Period = 5.0 so to convert this to frequency is 1/t so
frequency= 1/5

Now need to convert 550nm into m: (550nm = 5.5 × 10^7m)

Now need to apply the formula: V=f λ

V= (5.5 x 10^7) x (1/5)
= 0.00000011
= 1.1 x 10^-7

Did i do anything wrong? my teacher believes the answer to be 110m/s
 

AnimeX

Member
Joined
Aug 11, 2012
Messages
588
Gender
Male
HSC
N/A
Isn't it just 3x10^8 m/s
Might not be in the air medium

Your answer seems correct OP. But it doesn't really make sense that the frequency is that low.
Frequency of light is typically in the x10^15 area.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top