Hydrogen Balmer lines are essentially absent in the O and M type stars.

Answer the following statement true (T) or false (F)


True

Physics & Space Science

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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?

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science