A photon of wavelength 18.0 pm is scattered through an angle of 120° by a stationary electron. What is the wavelength of the scattered photon? (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 21.6 pm B) 22.9 pm C) 20.4 pm D) 19.2 pm E) 24.1 pm
A
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Fraunhofer was the German astronomer who first noted ________ lines in the Sun's spectrum
Fill in the blank(s) with correct word
A steel ball bearing of mass m1 and speed of magnitude v1 has a head-on elastic collision with a steel ball bearing of mass m2 at rest. Rank the speed v1 of m1 relative to v2, the magnitude of the speed of m2, after the collision when i) m1 > m2; ii) m1 = m2; and iii) m1 < m2
a. v1 < v2; v1 < v2; v1 < v2 b. v1 < v2; v1 = v2; v1 > v2 c. v1 < v2; v1 > v2; v1 > v2 d. v1 > v2; v1 = v2; v1 < v2 e. v1 > v2; v1 > v2; v1 > v2
Compared to spiral galaxies, elliptical galaxies have
A. ...more gas, more dust, and less new star formation. B. ...less gas, more dust, and more new star formation. C. ...less gas, less dust, and more new star formation. D. ...more gas, more dust, and more new star formation. E. ...less gas, less dust, and less new star formation.
Eighteen days past new moon, the Moon's phase is waning gibbous
Indicate whether the statement is true or false