### By how much has child reduced her mouth pressure

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Q1. A beam of parallel rays from a 24 MHz citizens band radio transmitter passes between two electrically conducting (hence opaque to radio waves) buildings located 45.00 m apart. What is an angular width of the beam as it emerges from between the buildings?

Q2. A child attempts to drink water in an open container through the 100 cm long straw, but finds that the water only rises 75 cm inside the straw. By how much has child reduced her mouth pressure below that of the atmosphere?

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