Question 1 Which of the following energies of light has the longest wavelength?

Question

Question 1

Which of the following energies of light has the longest wavelength?

6.25 x 10-14 J

2.85 x 10-19 J

6.14 x 10-19 J

4.22 x 10-18 J

9.02 x 10-20 J

Question 2

Which of the following transitions (in a hydrogen atom) represents emission of the highest frequency light?

n = 2 to n = 1

n = 5 to n = 4

n = 3 to n = 2

n = 4 to n = 1

n = 6 to n = 5

Question 3

Which of the following is a valid set of quantum numbers?

n = 4, l = 2, ml = -1

n = 2, l = 1, ml = 2

n = 3, l = 3, ml = 0

n = -3, l = 2, ml = -1

n = 2, l = 0, ml = 1

Question 4

The energy of one mole of photons having a wavelength of 630 nm is:

515 kJ

232 kJ

295 kJ

331 kJ

190 kJ

Question 5

Why don't we observe the deBroglie wavelength of everyday macroscopic objects (such as a moving car or a thrown baseball)?

The wavelength is too small relative to the size of macroscopic objects to be observed.

The macroscopic objects are moving to quickly for the wavelength to be observed.

Macroscopic objects do not have wave-like properties.

6.25 x 10-14 J

2.85 x 10-19 J

6.14 x 10-19 J

4.22 x 10-18 J

9.02 x 10-20 J

Explanation / Answer

Ans1: 9.02 x 10-20 J

Ans2:n = 2 to n = 1

Ans3:n = 4, l = 2, ml = -1

Ans4:190 kJ

speed of the light/wavelength= frequency

energy=frequency*planck's const...eq1

energy of 1 mol=6.02*10^23*energy in eq1

Ans5:The wavelength is too small relative to the size of macroscopic objects to be observed.

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