Which is an example of non-renewable energy source? a. petroleum
b. Solar energy
c. wind energy
d. geothermal energy

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

Name three different units of energy used to measure heat and describe what type of situations each is usually used.