Approximately how fast is an ion of helium moving if it is in a plasma with a temperature of 108 K? m(He) = 4.002 603 u and u = 1.66 × 10^?27 kg
a. 106 m/s
b. 104 m/s
c. 102 m/s
d. 10 m/s
e. 1 m/s
a
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A sound level of 80 dB has ___________ the amplitude of a 60 dB sound
a. ten times b. twenty times c. one tenth d. twice
Four different objects have spectra that peak in the wavelength regions listed below. Which peak wavelength region is associated with the coldest of the four objects?
A) x-rays B) visible light C) infrared D) ultraviolet
A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
a.
2.1 m/s
b.
1.7 m/s
c.
1.9 m/s
d.
1.5 m/s
e.
2.3 m/s
Charm, beauty, and truth are three quantum numbers for quarks
a. True b. False Indicate whether the statement is true or false