chemistry help pleasee?

Question

1) A infrared photon has a frequency of 9,469 GHz. What is its wavelength in centimeters (cm)?

2) Which of the following transitions of a single electron would require the absorption of a photon of light with the shortest wavelength?
Answer choices:
a) n = 3 to n = 2
b) n = 1 to n = 4
c) n = 2 to n = 4
d) n = 5 to n = 1
e) n = 3 to n = 5

3) Which is not a possible ml value for an orbital that has the following:
n = 6, l = 2
Ans choices:
a) -1
b) +1
c) -2
d) -3

Answer 1

1) lambda=c/frequency c=3*10^8 m/s f= 9.469*10^9
result 3*10^8/9.46910^9=0.0317m=3.17cm

2)b) n=1 to n=4 .all transition from n=1 require more ABSORPTION energy than from another shell and tne wavelength will be the shorter

3)d=3 as l=2 , ml can not have an absolute value higher than 2