The number of molecules decrease
I believe they are called Energy Levels or Energy Orbitals.
1)
average velocity:
(3,9)
(6,36)
average velocity=(36-9)m/(6-3) s=27m/3s=9 m/s
Answer: 9 m/s, east.
2)
(12, 144)
(15,225)
average velocity=(225-144)m/(15-12)s=81 m/3s=27 m/s
Answer: 27 m/s,east.
Answer:
Frequency = Velocity / Wavelength
or
f = v / λ
Answer: $109.5
Multiply $146 (original price) by 0.75 (the percentage) and there’s your answer!