1.Which of the following is evidence that the Earth is round? A. Neve's example with his magazine and apple.
B. A ship slowly appears on the horizon as it approaches
C. Earth's oceans are very deep
D. Both A and C

2. The Northern and Southern Hemispheres always have opposite seasons
A. true
B. false

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.