An electromagnetic wave with a wave length about the same as the diameter of an apple would be
A. x-ray.
B. UV.
C. infrared.
D. microwave.
E. radio wave.
D. microwave.
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Doubling the power output from a speaker emitting a single frequency will result in what increase in loudness?
a. 0.33 dB c. 4.8 dB b. 3.0 dB d. 9.0 dB
A hot (85.0°C) lump of metal has a mass of 210 g and a specific heat of 0.250 cal/g/°C. John drops the metal into a 345-g calorimeter containing 95 g of water at 21.3°C. The calorimeter is constructed of a material that has a specific heat of 0.100 cal/ g/°C. When equilibrium is reached, what will be the final temperature? cwater = 1.00 cal/g/°C
a. 35.6°C b. 63.9°C c. 49.6°C d. 39.7°C e. 29.4°C
Find the minimum diameter of a steel wire 18 m long that will stretch no more than 9 mm when a load of 380 kg is hung on the lower end. (Y steel = 2.0 × 10^11 N/m2)
Which of the following properties cannot be determined from a spectrum of a star?
A) speed perpendicular to my line of sight B) surface temperature C) speed towards me or away from me D) chemical composition