Nodes in the resulting standing wave

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Microwaves with a frequency of 10^10 Hz create a standing wave when reflected off a metal surface. The wavelength can be calculated using the formula lambda = c/f, where c is the speed of light. The nodes, where disturbance is zero, occur at positions x = 0, lambda/2, 3/2*lambda, etc. The spacing between successive nodes is determined to be lambda/2. This analysis provides a clear understanding of node placement in the standing wave pattern.
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Homework Statement


Microwaves of frequency 10^10 Hz are beamed directly at a metal
reflector. Neglecting the refractive index of air, determine the spacing
between successive nodes in the resulting standing wave.

Homework Equations



The Attempt at a Solution


dont know what to do here
 
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disturbance is zero at nodes for x=0, lambda/2, 3/2*lambda...
so lambda=c/f
and the the spacing is lambda/2 at the nodes
 

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