Answer:
1) B. 4.12 times 10^5 s^-1
2) B. frequency-v
3) C. 1.18 times 10^15 s^-1
4) B. 4.39 times 10^-19 J
5) B. Energy is absorbed
6) C. 3
7) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2
Explanation:
1)
The wavelength is inversely proportional to the frequency. Thus, the smallest frequency shall correspond to the longest wavelength. Thus, the correct answer is <u>B. 4.12 times 10^5 s^-1</u>
2)
<u>B. frequency-v</u> are wrongly paired because frequency is represented by f. Thus, correct pair will be frequency-f.
3)
The relationship between wavelength (λ) and frequency (f) is:
c = fλ
f = c/λ
where, c = speed of light = 3 x 10^8 m/s
f = (3x10^8 m/s) / (254 x 10^-9 m)
f = 1.18 x 10^15 s^-1
Thus, the correct option is <u>C. 1.18 times 10^15 s^-1.</u>
4)
The energy of photon is given as:
E = hc/λ
where, c = speed of light = 3 x 10^8 m/s
h = Plank's Constant = 6.625 x 10^-34 J.s
E = (6.625 x 10^-34 J.s)(3 x 10^8 m/s) / (453 x 10^-9 m)
E = 4.39 x 10^-19 J
Thus, the correct option is <u>B. 4.39 times 10^-19 J</u>.
5)
Since, the higher energy levels away from nucleus have higher energies. So, in order to move an electron from lower to higher or distant energy level, it must absorb energy from external source. So, the correct option is <u>B. Energy is absorbed</u>.
6)
The P-Sub-level has three orbitals, each having two electrons. Thus, P-Sub-Level accommodates total of 6 electrons. The correct option is <u>C. 3</u>
7)
The electronic configuration of barium atom is:
<u>1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 </u>
