21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 13QP
To determine
The surface temperature of a star that has a peak wavelength of
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At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?
a.
50 nm
b.
500 nm
c.
300 nm
d.
1.8 × 1011 nm
e.
180 nm
19. A hydrogen atom in excited energy state E24x 10" drops down to the ground state at energy level E
21.76 x 10"), giving off a photon.
a. What is the energy of the emitted photon injoules?
b. What is its wavelength?
c. Based on the EM spectrum, what type of raciation is this?
The electromagnetic (EM) spectrum is the term used by scientists to describe the entire range of light that exists with a speed of 300 million meters per second. Complete: Atoms will emit visible and ultraviolet light ...
A. as electrons jump from higher energy levels to lower levels.
B. as electrons jump from lower energy levels to higher levels.
C. as the atoms condense from a gas to a liquid.
D. as the electrons move about the atom within an orbit.
Chapter 5 Solutions
21st Century Astronomy
Ch. 5.1 - Prob. 5.1ACYUCh. 5.1 - Prob. 5.1BCYUCh. 5.2 - Prob. 5.2CYUCh. 5.3 - Prob. 5.3CYUCh. 5.4 - Prob. 5.4CYUCh. 5.5 - Prob. 5.5CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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- (a) What is the minimum value of 1 for a subshell that has 11 electrons in it? (b) If this subshell is in the n=5 shell, what is the spectroscopic notation for this atom?arrow_forwardWhy don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K? a. There is no hydrogen in stars this hot. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.arrow_forwardA star's spectrum peaks at 500 nm. What is the surface temperature of the star? O a. 5000 K b.2000 K C.5.8 x 106 K d.5800 Karrow_forward
- Determine the maximum wavelength for temperature 300K C. 810000nm D. 31nm A. 9666nm B. 810nm А. В. C. D.arrow_forwarda. Does a hot, thin gas emit a continuous spectrum, a bright line spectra with gaps between the lines, or a dark line spectra with all frequencies except the missing (absorbed) one? b. Why do we see dark line spectra when we look at stars? c. Both hydrogen and helium glow and absorb red. Are they the same frequency of red? d. A hot solid iron plate and a hot solid aluminum plate are the same temperature. Do the give off the same range of frequencies?arrow_forward4. What is the energy of a Hydrogen electron in the following energy states? a. n = 5 b. n = 3 c. What is the energy of a photon emitted when an electron transitions from the n = 5 state to the n = 3 state? d. What is the wavelength of this photon?arrow_forward
- An electron in a hydrogen atom transitions from the n=5 state to the n=1 state, emitting a photon. a. What is the energy in eV of the emitted photon? b. What is the wavelength in nanometers of the emitted photon? c. To what region of the electromagnetic spectrum does the emitted photon belong?arrow_forwardDetermine Amax the wavelength at the peak of the Planck distribution, at temperature 3000 K. A. 0.34 x 10-6 m. B. 1.10 x 10-6 m. C. 9.66 x 10-7 m. D. 5.62 x 10-7 m.arrow_forward19. A certain atom holds an electron with an initial energy of 6.4 eV above the ground state energy. At some time later the energy is 3.2 eV above ground state. What is the frequency associated with the emission of the photon for this transition? A. 9.4x10¹4 Hz B. 7.7x10¹4 Hz C. 2.1x10¹4 Hz D. 8.9x1014 Hzarrow_forward
- 2a. An atom in an excited state 1.94eV above the ground state remains in that excited state 1.97us before moving to the ground state. Calculate the frequency of the emitted photon. 2b. Calculate the wavelength of the emitted photon. 2c. Calculate the approximate uncertainty in energy of the photon.arrow_forward1. Complete the following statement: The term photon applies... A. only to x-rays. B. only to visible light. C. to any form of wave motion. D. to any form of electromagnetic radiation.arrow_forward8. At the center of the Sun, the mass density is p = 1.52 x 105kgm-3 and the mean opacity is K = 0.12m²kg-1. What is the mean free path for a photon at the Sun's center?arrow_forward
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