Errors and uncertainties questions
A student has a diffraction grating that is marked 3.5x10^3 lines per m.
1) Calculate the percentage uncertainty in the number of lines per metre suggested by this marking.
The answer I got was 1/3.5x10^3 (x100%) = 0.029% but the answer is 2.9%. What am I doing wrong?
2) State the absolute uncertainty in the value of the spacing?
The answer is + 0.01mm but I don t know how this is got either.
Any help would be great.
