MCQ
Sound waves in air are
- ATransverse
- ✓Longitudinal
- CDe-Broglie waves
- DAll the above
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Statement $1 :$ An inventor claims to have constructed an engine that has an efficiency of $30\%$ when operated between the boiling and freezing points of water. This is not possible.
Statement $2:$ The efficiency of a real engine is always less than the efficiency of a Carnot engine operating between the same two temperatures.
