please answer both! The moon is observed using a telescope that has an objective

Question

please answer both!

The moon is observed using a telescope that has an objective lens with a focal length of 3.0m and an eyepiece with a focal length of 7.5 cm. What is the angular diameter of the moon if the earth-moon distance is 3.85 Times 108 m and the diameter of the moon is 3.48 Times 106 m. 0.36 rad 9.0 rad 40 rad 4.7 rad 22 rad The electron emits or absorbs the energy changing the orbits. Hydrogen line spectra What is the wavelength of a transition between n = 3 and n = 1 orbits? 5500 A 100 A 10,270 A 12,800 A 1027 A

Explanation / Answer

hc/=12.08*1.6*10-19J

=1027A

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