Why is white light separated into a spectrum of colors when it is passed through a diffraction grating?

Consider a Bohr model of doubly ionized lithium. In what part of the spectrum is the emitted light?

When white light passes through a prism, which will be bent more, the red or green light? Explain your choice.

Why does a deuterium lamp produce a continuum rather than a line spectrum in the UV?

Diffraction gratings will display interference patterns only for visible light wavelengths if the slit spacing is appropriate.

An infrared absorption spectrum like that in Figure $43.9$ is taken when the sample of $\mathrm{HCl}$ is at a much higher temperature. Compared with Figure $43.9$, in this new spectrum are the highest absorption peaks
(a) at the same frequencies,
(b) farther from the gap, or
(c) closer to the gap?

What are the wavelength limits of the audible span of the sound spectrum? (Use the speed of sound in air.)

What distinguishes the mass spectrum of 2,2-dimethylpropane from the mass spectra of pentane and isopentane?

The infrared spectrum of the compound with the mass spectrum shown below has a medium-intensity peak at about 1650 cm$^{-1}$. There is also a C-H out-of-plane bending peak near 880 cm$^{-1}$. Propose a structure consistent with the data.

Choose the best answer.

The absorption spectrum of chlorophyll

a. is not the same as that of carotenoids.

b. approximates the action spectrum of photosynthesis.

c. explains why chlorophyll is a green pigment.

d. shows that some colors of light are absorbed more than others.

e. All of these are correct.

A compound with the molecular formula $\mathrm{C}_{8} \mathrm{H}_{18}$ exhibits a $^1 \mathrm{H}$ NMR spectrum with only one signal. How many signals would you expect in the $^{13} \mathrm{C}$ NMR spectrum of this compound?

If an astronomer examines the emission spectrum from luminous hydrogen gas that is moving away from Earth at a high speed and compares it to a spectrum of hydrogen seen in a laboratory on Earth, what would be different about the frequencies of spectral lines from the two sources?

A-line is detected in the hydrogen spectrum at $1880 \mathrm{~nm}$. Is this line in the Balmer series? Explain.

A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 40000 ly (light-years) from the galactic center and has a speed of 275 km/s. (a) Estimate the total mass of the galaxy based on the motion of the star. (b) The total visible mass (i.e., matter we can detect via electromagnetic radiation) of the galaxy is

$$10 ^ { 11 }$$

solar masses. What fraction of the total mass of the galaxy is visible, according to this estimate?