In an ultrasound scan of a pregnant woman, the waves had a frequency of 3.0 MHz and a wavelength of 4.9 × 104 m. The waves took 1.12 × 104 s
to be reflected from the baby’s nose. How far was the nose from the ultrasound transducer?

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.