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

Physics & Space Science

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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

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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

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Charm, beauty, and truth are three quantum numbers for quarks

a. True b. False Indicate whether the statement is true or false

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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

Physics & Space Science