Estimate the effective temperature of the sun from the fact that the human eye is sensitive to light in the range 400-700 nm (1nm = 10^-9m). hint: use wien's law.
the book used is "astrophysics in a nutshell" by dan maoz

Classify each possible hypothesis about a medicinal aloe vera plant as falsifiable or non-falsifiable. aloe vera gel is the best natural skin moisturizer. aloe vera gel can heal wounds by boosting cell renewal. aloe vera juice tastes better than carrot juice. drinking aloe juice can reduce the risk of lung cancer.

Sound is a disturbance that travels through a medium as a

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2