Question

WILL FAN AND MEDAL PLEASE HELP

The wavelength of red light is given as 6.5 × 10È¥ m. If another wave of an unknown type has a frequency of 5.3 × 10¹¢ Hz. What is the relation between the wavelength of the unknown wave and red light? (note: c = 2.998 × 10§ m/s)

The wavelength of the unknown wave is less than the wavelength of the red light

the wavelength of the wave is greater than the wavelength of the red light

the wavelength of the wave is equal to the wavelength red light

the wavelength of the wave is not related to the wavelength of the red light

Answer 1

\[c = f \lambda \]

Answer 2

c = velocity
f= frequency
\[\lambda = wavelength \]

Answer 3

I have no clue what to do with that...

Answer 4

I think it's A but I'm not sure...

Answer 5

to compare the wavelengths we have to obtain a value for the wavelength of the unknown wave
using the above equation obtain a value.
\[\lambda = \frac{ c }{ f } \]

Answer 6

So... C? because that's what's looking right now...

Answer 7

no no !! Wait I'll tell you but tell me the value for C !!! It's a little unclear !

Answer 8

if u don't mind right the values here again it's a little unclear !! type it here, don't copy paste

Answer 9

2.998*10^8 m/s

Answer 10

sorry open study turns the notations into weird symbols

Answer 11

what about the values for others !!! It's not clear ! ^_^

Answer 12

6.5*10^-7 is the first one and 5.3*10^15

Answer 13

aaah okai. Now we know the wavelength of the red light. We are given with the frequency of the unknown wave.
Looking at the answers we can see that they have compared the wavelengths. We only know the wavelength of the red light, to compare the wavelengths we have to find the wavelength of the unknown wave right? Do u understand up to this point ?

Answer 14

I do.

Answer 15

I just don't know how to find the wave length, I get confused with the numbers

Answer 16

Now we have to find the wavelength of the unknown wave.
So we are gonna use the above equation:
\[c = f \lambda \]
\[\lambda = \frac{ c }{ f } = \frac{ 2.998 * 10^{8} }{ 5.3 * 10^{15} }\]

Answer 17

\[\lambda = 5.65 * 10^{-8}\]

Answer 18

As we can see that the unknown wave has a shorter wavelength than the red light !

Answer 19

Thank you!