Questions from Modern Physics

Q: a. An atom initially in an energy level with E =

a. An atom initially in an energy level with E = -6.52 eV absorbs a photon that has wavelength 860 nm. What is the internal energy of the atom after it absorbs the photon? b. An atom initially in an...

Q: Use Balmer’s formula to calculate a. the wavelength,

Use Balmer’s formula to calculate a. the wavelength, b. the frequency, and c. the photon energy for the Hg line of the Balmer series for hydrogen.

Q: Using a mixture of CO2, N2, and sometimes He,

Using a mixture of CO2, N2, and sometimes He, CO2 lasers emit a wavelength of 10.6 mm. At power outputs of 0.100 kW, such lasers are used for surgery. How many photons per second does a CO2 laser deli...

Q: Pulsed dye lasers emit light of wavelength 585 nm in 0.

Pulsed dye lasers emit light of wavelength 585 nm in 0.45-ms pulses to remove skin blemishes such as birthmarks. The beam is usually focused onto a circular spot 5.0 mm in diameter. Suppose that the o...

Q: How many photons per second are emitted by a 7.50

How many photons per second are emitted by a 7.50-mW CO2 laser that has a wavelength of 10.6 µm?

Q: Photorefractive keratectomy (PRK) is a laser-based surgical procedure

Photorefractive keratectomy (PRK) is a laser-based surgical procedure that corrects near- and farsightedness by removing part of the lens of the eye to change its curvature and hence focal length. Thi...

Q: A large number of neon atoms are in thermal equilibrium. What

A large number of neon atoms are in thermal equilibrium. What is the ratio of the number of atoms in a 5s state to the number in a 3p state at a. 300 K; b. 600 K; c. 1200 K? The energies of these s...

Q: A candle 4.85 cm tall is 39.2 cm

A candle 4.85 cm tall is 39.2 cm to the left of a plane mirror. Where is the image formed by the mirror, and what is the height of this image?

Q: If a piece of photographic film is placed at the location of

If a piece of photographic film is placed at the location of a real image, the film will record the image. Can this be done with a virtual image? How might one record a virtual image?

Q: Figure 39.19a shows the energy levels of the sodium atom

Figure 39.19a shows the energy levels of the sodium atom. The two lowest excited levels are shown in columns labeled 2P3/2 and 2P1/2. Find the ratio of the number of atoms in a 2P3/2 state to the numb...