Antiquity's greatest observer of stars was named a. Hipparchus. ...

[fahad]

Antiquity's greatest observer of stars was named
 a. Hipparchus.
  b. Eratosthenes.
  c. Aristotle.
  d. Imhotep.

Question 2

The energy differences in some of the rotational energy levels of the water molecule allow
 a. X-rays to be produced.
  b. cooking with microwaves.
  c. visible spectral lines to be formed.
  d. lasers to operate.

[JaynaD87]

Answer to Question 1

a

Answer to Question 2

b

[fahad]

Excellent

[abro1885]

Thanks for the timely response, appreciate it