All of Earth's weather occurs in the
A) lower levels of the atmosphere.
B) troposphere.
C) tropopause.
D) troposphere and stratosphere.
Answer: B
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The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.
Mathilda collects photoelectric data in her physics laboratory
She measures a stopping potential of 5.82 volts for radiation of wavelength 100. nm, and 17.99 volts stops 50.0 nm. (a) What is the work function for the material in eV? (b) From her data one determines Planck's constant to be what?
Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed b. motion of any charged particle changes c. motion of a positively charged particle is changed d. motion of a negatively charged particle is changed e. acceleration of any charged particle is changed
Standing Waves on a String: A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed.(a) Determine the distance between two adjacent nodes.(b) Determine the wavelength of the waves that travel on the string.(c) Determine the speed of traveling waves on this string.(d) Determine the fundamental frequency of this string.
What will be an ideal response?