(a) 159 nm
First of all, let's calculate the energy difference between the level E1 and E4:
Now we know that this energy difference is related to the wavelength of the absorbed photon by
where
is the Planck constant
is the speed of light
is the wavelength of the photon
Solving for , we find
b) 293 nm
As done in part a), let's calculate the energy difference between the level E2 and E3:
this energy difference is related to the wavelength of the absorbed photon by
Solving for again, we find
c) 226 nm
As done in part a) and b), let's calculate the energy difference between the level E1 and E3:
this energy difference is related to the wavelength of the emitted photon by
Solving for again, we find
Diffraction equation applies in this case:
d*Sin x = m*wavelength, where d = spacing of lines, x = angle = 39.5°, m = order of maximum = 2
Substituting;
d* Sin 39.5 = 2*600*10^-9
d = (2*600*10^-9)/Sin 39.5 = 1.88656*10^-6 m
In 1 mm (or 0.001 m), the number of lines is given as;
Number of lines = 0.001/d = 0.001/(1.88656*10^-6) = 530.065 ≈ 530 lines
14. The Aurora is an incredible light show caused by collisions between electrically charged particles released from the sun that enter the earth's atmosphere and collide with gases such as oxygen and nitrogen. The lights are seen around the magnetic poles of the northern and southern hemispheres.
15.
About 5.4 billion years from now, the sun will have exhausted all of its hydrogen. The sun's core will get really hot and dense, thus shrinking; however, the outer region of the sun will expand and grow. ... Even if the expanding dying sun doesn't reach Earth, the sun's high temperatures will completely burn the planet.
Explanation:
Because they change the direction of force and multiply the effort.
They increase the rate of doing work.
So, MA of first class lever can be one or greater than one or less than one
