Question 1

The energy gap for a semiconductor is 1.25 eV. Of the frequencies given below, what is the minimum frequency photon than can move an electron from the valence band to the conduction band?

Accepted Answer

The answer of The energy gap for a semiconductor is...

Question 2

Solid argon has a density of 1650 kg/m³. The atomic weight of argon is 40.0. Assuming each atom occupies a cubical volume, what is the distance between the argon atoms?

Accepted Answer

The answer of Solid argon has a density of 1650...

Question 3

In the hydrogen molecule, H₂, the separation between the protons is 10−¹⁰ m. If the molecule is in its first rotational energy state, what is the angular velocity of the molecule about its center of mass?

Accepted Answer

The answer of In the hydrogen molecule, H₂, the separation...

Question 4

The smallest object one can distinguish using the electron microscope is on the order of one nanometer (1 nm = 10−⁹ m). How many atoms of gold are contained in a cube whose edge is 1 nm long? The atomic mass of gold is 197 and its density is 19.3 g/cm³.

Accepted Answer

The answer of The smallest object one can distinguish using...

Question 5

An LED emits light of wavelength 600 nm. What is its band gap?

Accepted Answer

From the relationship between band gap energy (Eg) and emission wavelength (λ) for direct bandgap materials: 
Eg = (1239.8 eV * nm) / λ
Substituting λ = 600 nm, we get:
Eg = (1239.8 eV * nm) / 600 nm = 2.07 eV 
Thus, choice D is correct.

Question 6

What is the energy of the first rotational state of the hydrogen (H₂) molecule? The separation between the protons is 10−¹⁰ m and the mass of each proton is 1.67 × 10−²⁷ kg. (h = 6.626 × 10−³⁴ J ⋅ s and 1 eV = 1.6 × 10−¹⁹ J.)

Accepted Answer

The answer of What is the energy of the first...

Quiz 43: Molecules and Solids

The energy gap for a semiconductor is 1.25 eV. Of the frequencies given below, what is the minimum frequency photon than can move an electron from the valence band to the conduction band?

Solid argon has a density of 1650 kg/m3. The atomic weight of argon is 40.0. Assuming each atom occupies a cubical volume, what is the distance between the argon atoms?

In the hydrogen molecule, H2, the separation between the protons is 10−10 m. If the molecule is in its first rotational energy state, what is the angular velocity of the molecule about its center of mass?

The smallest object one can distinguish using the electron microscope is on the order of one nanometer (1 nm = 10−9 m). How many atoms of gold are contained in a cube whose edge is 1 nm long? The atomic mass of gold is 197 and its density is 19.3 g/cm3.

An LED emits light of wavelength 600 nm. What is its band gap?

What is the energy of the first rotational state of the hydrogen (H2) molecule? The separation between the protons is 10−10 m and the mass of each proton is 1.67 × 10−27 kg. (h = 6.626 × 10−34 J ⋅ s and 1 eV = 1.6 × 10−19 J.)

Solid argon has a density of 1650 kg/m³. The atomic weight of argon is 40.0. Assuming each atom occupies a cubical volume, what is the distance between the argon atoms?

In the hydrogen molecule, H₂, the separation between the protons is 10−¹⁰ m. If the molecule is in its first rotational energy state, what is the angular velocity of the molecule about its center of mass?

The smallest object one can distinguish using the electron microscope is on the order of one nanometer (1 nm = 10−⁹ m). How many atoms of gold are contained in a cube whose edge is 1 nm long? The atomic mass of gold is 197 and its density is 19.3 g/cm³.

What is the energy of the first rotational state of the hydrogen (H₂) molecule? The separation between the protons is 10−¹⁰ m and the mass of each proton is 1.67 × 10−²⁷ kg. (h = 6.626 × 10−³⁴ J ⋅ s and 1 eV = 1.6 × 10−¹⁹ J.)