The radioactive isotope 226Ra (atomic number 88 ) decays to the isotope 222Rn (atomic number 86). What type of radioactive decay is this?
A) beta decay
B) electron ionization
C) electron capture
D) alpha decay
D
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While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity
A) increases. B) remains unchanged. C) decreases.
Which of the following types of electromagnetic radiation has the lowest energy?
a. x-rays b. visible light c. ultraviolet d. gamma-rays e. infrared radiation
A photon of initial wavelength 0.651 nm, after being scattered from a free electron at rest, moves off at an angle of 120° with respect to its incident direction. (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
(a) What is the wavelength of the scattered photon? (b) What is the energy of the scattered photon? What will be an ideal response?
Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts by Arthur's side at the same time and runs back and forth between them at 5.0 m/s
By the time Arthur and Betty meet, what distance has Spot run?