Am I missing something like it must be a maximum intensity or something?
Can anyone point me towards a website on second-order spectrum stuff, i have looked can't find any decent information on the topic (only general ideas)
Ahh good idea, so your saying find the an equivalent velocity (or proportion) of the ambulance in the direction straight towards the observer that makes sense.
thanks
Homework Statement
A line corresponding to light of the wavelength 519.8 nm is observed at an angle 12 degrees in the second-order spectrum of a diffraction grating. The grating is 1 cm in width,
what is the line spacing of the grating?
how many per centimetre?
what is the lowest order...
Ah thank you so much its is 0.5 meter wave length, that formula is wrong (my fault) and now I get the right sort of answers being 0.125, 0.375, 0.625 and 0.875 m
thanks again
165 Hz giving
L=4*f/(n*v)
n=1: L = 4*165/(1*340) = 1.9 m
n=3: L = 4*165/(3*340) = .647 m
n=5: L = 4*165/(5*340) = 0.388 m
which is in the right area
but don't i want resonate frequency which would be a full oscillation?
sorry lots of reading but i wanted to explain what I've done (tried to do)
Homework Statement
An ambulance has a loud siren, which emits a pure note at 5100Hz. A man 20 m from a straight road along which the ambulance is travelling, and records the frequency of the sound he hears from the...
If it helps you can ignore the link, only have to treat the water as closed end, the only problem is the above is still wrong (teacher gave us a hint).
I don't understand what I'm doing wrong I believe its the right formula and also the right method am I stuffing up units?
So my method is right? If anyone has spare time on their hands to double check my answers that will be much appreciated (i'm a little foggy in the air and would love to know if I'm getting the right answer)
There are several ways to approach this question, how did you find the domain?
by observation? or trial and error? or did you approach this a more formal way.
If you attempted by observation or trial and error simply rearrange the equation so it is in terms of x and do the same as what you...
Homework Statement
The water level in a vertical glass tube (length 1 m) can be adjusted to any position in the tube. A tunning fork vibrating at 660 Hz is held just over the open end of the tube. calculate at what position of the water level will there be resonance (standing waves) in the...
Homework Statement
Sally is a police officer who is standing in an intersection. A car driven by David approaches the intersection at a speed of 75 km/h. Sally blows her whistle (at a frequency of 900 hz) and signals the driver to stop. What does frequency does David hear? (speed of sound is...
the question has given 4 variables and only 3 equations so you can not find a,b,c,z what you may be able to do is find a,b,c in terms of z and a constant.
to do this continue wih the subsitition of one equation into another treating z as a constant
not sure how you got 4a+5b+4c=10...
Okay so the question is
15. (a) Calculate the electric capacitance of the Earth.
(b) Positively charged cosmic ray particles are known to arrive at Earth at the rate of
approximately 1 particle per square centimetre per second. If each particle is
assumed to be singly charged...