Hydrogen Balmer lines are essentially absent in the O and M type stars.
Answer the following statement true (T) or false (F)
True
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The speed of sound in the air inside a 0.640-m long gas column is 340 m/s. What is the fundamental resonant frequency of this air column if it is
(a) open at one end and closed at the other end? (b) open at both ends?
Projectile Motion: You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
A. 28 m/s B. 20 m/s C. 40 m/s D. 37 m/s
A certain crystal has an interatomic spacing of 0.442 nm. A beam of neutrons moving with a speed of 1640 m/s is diffracted from the crystal. What is the de Broglie wavelength of the neutron?
A) 0.121 nm B) 0 nm C) 0.241 nm D) 0.484 nm E) 0.682 nm
Interference effects observed in the early 1800s were instrumental in supporting a concept of the existence of which property of light?
a. polarization b. particle nature c. wave nature d. electromagnetic character