sunny86
Oct10-04, 12:09 AM
:cry:
1. [Take the speed of sound in air as 345 m/s in this question.]
A pair of speakers separated by 0.700m are driven by the same oscillator at a frequency of 690 Hz .An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the two speakers.
a) How far must the observer walk before reaching the first maximum in intensity ?
b) How far will the observer be from the speaker when the first minimum is detected in the intensity ?
2. How wide is the central diffraction peak on a screen 3.50 m behind a 0.0655-mm-wide slit illuminated by 400-nm light ?
3. White light containing wavelengths from 400nm to 750nm falls on a grating with 7800 lines/cm . How wide is the first-order spectrum on a screen 2.80 m away ?
1. [Take the speed of sound in air as 345 m/s in this question.]
A pair of speakers separated by 0.700m are driven by the same oscillator at a frequency of 690 Hz .An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the two speakers.
a) How far must the observer walk before reaching the first maximum in intensity ?
b) How far will the observer be from the speaker when the first minimum is detected in the intensity ?
2. How wide is the central diffraction peak on a screen 3.50 m behind a 0.0655-mm-wide slit illuminated by 400-nm light ?
3. White light containing wavelengths from 400nm to 750nm falls on a grating with 7800 lines/cm . How wide is the first-order spectrum on a screen 2.80 m away ?