Two flat glass plates are in contact along one end and are ...

[gbarreiro]

Two flat glass plates are in contact along one end and are separated by a sheet of tissue paper at the other end. A monochromatic source of wavelength 490 nm illuminates the top plate. If 20 dark bands are counted across the top plate, what is the paper thickness? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact.
 a. 2.7  10-6 m
  c. 4.7  10-6 m
  b. 3.4  10-6 m
  d. 4.9  10-6 m

Question 2

What is the internal energy of a monatomic ideal gas with pressure 6 105 Pa and with volume 2 m3?
 a. 6  105 J
  b. 18  105 J
  c. 9  105 J
  d. More information is needed to find this value.

[cassie_ragen]

Answer to Question 1

C

Answer to Question 2

B

[gbarreiro]

Thank you!

[cassie_ragen]

Always glad to help...