For a given medium such as air, sound has a slower speed at lower temperatures. Having read the above passage, choose the right answer to the following question (choices are warm day or colder day? ): Would a microphone designed to listen for avalanches detect the sound of falling snow sooner on a warm day or colder day??
warm day

If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser. Having read the above passage, choose the right answer to the following question (choices are more or less ): Peter added salt to his juice one morning. The mixture became more or less dense?
more

Q: The farther the object is stretched or compressed, the greater its elastic potential energy is. Having read the above passage, choose the right answer to the following question (choices are decreases or increases ): Letting a stretched a rubber band become looser decreases or increases its elastic potential energy?
A: decreases

Question: Higher frequency waves have greater energy. Having read the above passage, choose the right answer to the following question (choices are more or less ): A wave with a low frequency has more or less energy than a wave with a high frequency?
Answer: less

*Question*
This means that as wavelengths get shorter, more waves move past a particular spot in the same amount of time. Having read the above passage, choose the right answer to the following question (choices are increases or decreases ): What happens to the rate at which waves move past a particular spot if Jim decreases the wavelength of a sound wave increases or decreases?
**Answer**
increases

*Question*
Better farming techniques and machines increased the food supply and the distribution of food. Having read the above passage, choose the right answer to the following question (choices are more or less ): If farming techniques would be lost, there might be more or less people that starve and go hungry?
**Answer**
more