Question

Which of the following frequencies corresponds to light with the longest wavelength? A) 3.00 times 10^13 s^-1 B) 4.12 times 10^5 s^-1 C) 8.50 times 10^20 s^-1 D) 9.12 times 10^12 s^-1 E) 3.20 times 10^9 s^-1 2. Which of the following are incorrectly paired? A) wavelength - lambda B) frequency - v C) speed of light - c D) hertz - s^-1 E) x-rays - shortest wavelength 3. A line in the spectrum of atomic mercury has a wavelength of 254 nm. When mercury of light at this wavelength, the frequency of this light is A) 8.47 times 10^-16 s^-1 B) 7.82 times 10^-19 s^-1 C) 1.18 times 10^15 s^-1 D) 76.1 s^-1 E) none of these 4. What is the energy of a photon of blue light that has a wavelength of 453 nm? A) 4.53 times 10^-7 J B) 4.39 times 10^-19 J C) 6.62 times 10^14 J D) 9.00 times 10^-32 J E) 2.28 times 10^18 J 5.In Bohr's atomic theory, when an electron moves from one energy level to another distant from the nucleus: A) Energy is emitted. B) Energy is absorbed. C) No change in energy occurs. D) Light is emitted. E) None of these. 6.A given set of p orbitals consists of orbitals. A) 1 B) 2 C) 3 D) 4 E) 5 7.The electron configuration for the barium atom is: A) 1s^22s^22p^63s^23p^64s^23d^10

Answer 1

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 B. 4.12 times 10^5 s^-1

2)

B. frequency-v 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 C. 1.18 times 10^15 s^-1.

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 B. 4.39 times 10^-19 J.

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 B. Energy is absorbed.

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 C. 3

7)

The electronic configuration of barium atom is:

1s^2  2s^2  2p^6  3s^2  3p^6  4s^2  3d^10  4p^6  5s^2  4d^10  5p^6  6s^2