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In a lab, two otherwise identical vacuum photocells X and Y are illuminated with the same monochromatic light. The lamp position is adjusted so that, at zero applied voltage, both cells have the same initial photocurrent. The stopping potentials measured to just reduce the current to zero are |Vstop,X| = 0.70 V and |Vstop,Y| = 0.40 V. Which statement must be true?
Two identical loudspeakers S1 and S2 are driven in phase at a single frequency on a lab bench. At a point P in front of them the sound level is at a pronounced minimum. Reflections are negligible and air conditions are uniform. Which statement about the path difference Ξ΄ = |PS2 β PS1| at P must be true?
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