The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The distance from the starting point is 16 m
a. True
b. False
Indicate whether the statement is true or false
False
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Compound Microscope: The objective lens and the eyepiece of a microscope have focal lengths of 4.0 mm and 25 mm, respectively. The objective produces a real image 30 times the size of the object, with the final image viewed at infinity. The near point of the microscope user is at 25 cm. What is the magnitude of the overall magnification of the microscope?
A. 250 B. 300 C. 350 D. 400 E. 450
The microwave in the kitchen has a label that indicates it produces its microwaves at a frequency of 2450 MHz. What is the energy associated with one of these microwave photons? (h = 6.63 × 10^?34 J?s)
a. 3.19 × 10^–2 eV b. 2.45 eV c. 1.02 × 10^–5 eV d. 1.62 eV
Energy Levels: The figure shows part of the energy level diagram of a certain atom. The energy spacing between levels 1 and 2 is twice that between 2 and 3. If an electron makes a transition from level 3 to level 2, the radiation of wavelength ? is emitted. What possible radiation wavelengths might be produced by other transitions between the three energy levels?
A. both ?/2 and ?/3 B. only ?/2 C. both 2? and 3? D. only 2?
Which of the following statements is true of green grass?
A) It absorbs red light and reflects green light. B) It absorbs red light and emits green light. C) It transmits all colors of light except green. D) It means the lawn is healthy.