hey can u help me in my assignment?

Question

1) A person standing in the park notices that after a wave crest passed by ten more crests pass in a time of 120 sec. What is the frequency of the wave?

2) A light waves travel through air at a speed of 3 x 10(to the 3rd power) m/s. Red light has a wavelength of about 6.6 x 10(to the negative seventh power) meter. What is the frequency of the red light?

Answer 1

1) 10 full wave-length passed by 120 sec so the wave period is 12 sec. f=1/T so f=0.083333 Hz
2) First of all, light speed=3 x 10^8 m/s.
Secondly, f=v/lambda
(where v=light speed and lambda=wave-length)
so f=3X10^8 / 6.6 x10^(-7)=4.5454 x 10^14 Hz (approx. 4500 GHz = Giga Hertz)

Answer 2

1) frequency = number of waves passed throug a point in one second.
Here you got 10 waves passed in 120sec
=> 10 / 120 waves passed in a second
=> frequency = 1/12 hz (or) cycles per second.


2) speed of light = frequency * wave length
here 3 * 10^3 = f * 6.6 * 10^(-7)
=> frequency of red light = 1/2.2 * 10^10 hz.

Answer 3

i'll answer the second one... i hope its right
speed = wavelength * frequency
( i think this is the formula)
so frequency = speed/ wavelength = .45 * 10 ^10 = 4.5 * 10 ^ 9 m

btw, doesn't light travel at the speed of 3 * 10 ^8 m/s

Answer 4

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Answer 5

ouch .. reading that got me a headache ...
sorry can't help you ..

may you should get the formula, then insert the number to the variable, then compute....

Answer 6

ooops asignment oh no I can`t.