Energy Levels: The longest wavelength photon that can be emitted by a hydrogen atom, for which the final state is n = 9, is closest to which one of the following values? (c = 3.0 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 39,000 nm
B. 22,000 nm
C. 7400 nm
D. 16,000 nm
E. 28,000 nm
Answer: A
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If the absolute temperature of an object is tripled, the thermal power radiated per unit surface area of this object will (assuming that its emissivity is not affected by the temperature change)
A) increase by a factor of 3. B) increase by a factor of 9. C) increase by a factor of 18. D) increase by a factor of 27. E) increase by a factor of 81.
Magnetic Materials: When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its magnetic domains becomes
A. smaller. B. zero. C. larger.
Which of the following is NOT true about adding comment features to a website?
A. Do not require users to create an account before posting comments. B. Comments help a website creator gauge interest in a post or article. C. To add a comments feature, you can add a premade script to your website code. D. Spam often appears in comments.
The supercontinent of Pangaea formed during the
A) Cenozoic. B) Paleozoic. C) Mesozoic. D) Precambrian.