# All Questions

134,171 questions
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### For a real battery, why is two identical bulbs in parrallel slightly more dim than just one in series

Image for reference : r = 0.8 Ohm - Emf = 1.5V - A = B = 6 Ohm The current when the switch is open, the only other resistor is the A bulb, so total resistance is 6.8 Ohms, but when its closed the ...
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### Is the second diffraction order at different wavelength?

If a monochromatic laser light of wavelength $\lambda$ is incident on a diffraction grating of period $A$, then does the second ($m$=2) diffraction orders have same or different $\lambda$? From the ...
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### Exciting surface plasmon polaritons - what is the purpose of air gap in Otto configuration?

I am currently reading about exciting surface plasmon polaritons (SPPs). One of the most common methods described in literature for exciting a SPP is using the Otto configuration (image from https://...