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neno:
so the speed of a stationary wave is not the same as a progressive wave...but everything else is the same ryt the wavelength and the frequency....

Phosu:
28 Microwaves of wavelength 3.00 cm are incident normally on a row of parallel metal rods. The separation of the rods is 8.00 cm. The first order diffraction maximum is observed at an angle of 22.0° to the direction of the incident waves.

What is the angle between the first and second order diffraction maxima?
A 22.0° B 26.6° C 44.0° D 48.6°

astarmathsandphysics:
Strange question
28 microwaves?
Where is the question from

Phosu:
nov 03 pp1,
i also have a few more doubts
4, 6, 14, 16,

vanibharutham:
d sin(theta) = n Lamba

for the first order maxima, i.e. the central maxima

8 sin (theta) = 3 x 1

Theta = 22.04

confirmed :)

For the second order maxima,

8 sin (theta) = 2 x 3

theta = 48.6

therefore, the angle between them is

48.6 - 22 = 26.6

Therefore B

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