The star-gas-star cycle will continue forever because stars are continually recycling gas
Indicate whether the statement is true or false
FALSE
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Energy Levels: What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 199 nm B. 365 nm C. 4480 nm D. 398 nm E. 796 nm
An aircraft that flies faster than the speed of sound is said to be
A) subsonic. B) supersonic. C) impossible. D) none of the above
In an x-ray tube, high-speed electrons are slammed into a lead target, giving off x-rays. If the electrons are accelerated from rest through a potential difference of 160 000 volts, what speed do they have when they strike the target? (qe = 1.6 × 10^?19 C, me = 9.11 × 10^?31 kg, and c = 3.00 × 10^8 m/s)
a. 0.79c b. 0.65c c. 0.83c d. 0.49c e. 0.48c
Coherent light of a single frequency passes through a double slit with a separation d, to produce a pattern on a screen as distance D from the slits. What would cause the separation between adjacent minima on the screen to increase?
A. increase the index of refraction of the medium in which the setup is immersed B. increase the separation d between the slits C. increase the distance D D. increase the frequency of the incident light