Questions from Modern Physics

Q: a. A forward-bias voltage of 15.0 mV

a. A forward-bias voltage of 15.0 mV produces a positive current of 9.25 mA through a p-n junction at 300 K. What does the positive current become if the forward-bias voltage is reduced to 10.0 mV? b...

Q: A p-n junction has a saturation current of 6.

A p-n junction has a saturation current of 6.40 mA. a. At a temperature of 300 K, what voltage is needed to produce a positive current of 40.0 mA? b. For a voltage equal to the negative of the valu...

Q: During each of these processes, a photon of light is given

During each of these processes, a photon of light is given up. In each process, what wavelength of light is given up, and in what part of the electromagnetic spectrum is that wavelength? a. A molecu...

Q: A hypothetical NH molecule makes a rotational-level transition from l

A hypothetical NH molecule makes a rotational-level transition from l = 3 to l = 1 and gives off a photon of wavelength 1.780 nm in doing so. What is the separation between the two atoms in this molec...

Q: The H2 molecule has a moment of inertia of 4.6

The H2 molecule has a moment of inertia of 4.6 * 10-48 kg . m2. What is the wavelength l of the photon absorbed when H2 makes a transition from the l = 3 to the l = 4 rotational level?

Q: The water molecule has an l = 1 rotational level 1.

The water molecule has an l = 1 rotational level 1.01 * 10-5 eV above the l = 0 ground level. Calculate the wavelength and frequency of the photon absorbed by water when it undergoes a rotational­leve...

Q: Two atoms of cesium (Cs) can form a Cs2 molecule

Two atoms of cesium (Cs) can form a Cs2 molecule. The equilibrium distance between the nuclei in a Cs2 molecule is 0.447 nm. Calculate the moment of inertia about an axis through the center of mass of...

Q: The rotational energy levels of CO are calculated in Example 42.

The rotational energy levels of CO are calculated in Example 42.2. If the energy of the rotating molecule is described by the classical expression K = 1/2 Iω2, for the l = 1 level what are...

Q: How many protons and how many neutrons are there in a nucleus

How many protons and how many neutrons are there in a nucleus of the most common isotope of a. silicon, 14 28

Q: As Eq. (40.21) indicates, the time

As Eq. (40.21) indicates, the time-dependent wave function for a stationary state is a complex number having a real part and an imaginary part. How can this function have any physical meaning, since p...