Which of the following demonstrated the relation between the atomic number of a given element and the wavelength of the K-alpha x-ray photon emitted by that element?
a. Bohr
b. Compton
c. Moseley
d. Pauli
c
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Projectile Motion: An athlete participates in an interplanetary discus throw competition during an Olympiad that takes place on a planet where the acceleration due to gravity is 9.7 m/s2. He throws the discus with an initial velocity of 20 m/s at an angle of 60° from the vertical. Neglecting air resistance and the height of the discus at the point of release, what is the range of the discus?
A. 21 m B. 60 m C. 36 m D. 40 m E. 32 m
Delivering quality video over the web is challenging because of the large size of video files.
Answer the following statement true (T) or false (F)
In electricity, what quantity is analogous to the "acceleration of gravity" g (which is a force per unit mass)?
A) electric force B) electric field C) electric potential D) electric charge E) an electric dipole
The Planck time is
A) the shortest time that has any physical meaning. B) the time required for pair creation. C) the time it takes for light to travel across--or around--the entire universe. D) the time when the cosmic background radiation originated. E) the time it takes for an electron in an unexcited hydrogen atom to orbit the nucleus one time.