What is the relative humidity of air when it is at its dew point?
What will be an ideal response?
The relative humidity is 100 %.
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In beta decay, the emitted particle is
a) an electron b) a photon of electromagnetic energy. c) a hydrogen nucleus. d) the nucleus of a helium atom. • •
What energy is released (in MeV) during a reaction in which 1.67 × 10-25 kg of material is converted to energy?
A) 5.0 × 10-14 MeV B) 4.1 × 10-7 MeV C) 6.7 × 107 MeV D) 3.1 × 10-4 MeV E) 9.4 × 104 MeV
If the temperature of a volume of ideal gas increases for 100°C to 200°C, what happens to the average kinetic energy of the molecules?
a. It halves. c. It increases but less that double. b. It doubles. d. It increases more than double.
A particle moving along the x axis has a position given by x = 54t - 2.0t3 m. At the time t = 3.0 s, the speed of the particle is zero. Which statement is correct?
a. The particle remains at rest after t = 3.0 s. b. The particle no longer accelerates after t = 3.0 s. c. The particle can be found at positions x < 0 m only when t < 0 s. d. All of the above are correct. e. None of the above is correct.