Which of the following is used in sonata ii's prepared piano?
a. wooden blocks
b. coins
c. copper wire
d. small pieces of rubber

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.

A341.3 hz tuning fork is resonating in a closed tube on a cool day. if the tube has a length of 0.24 m, then what is the speed of sound in this experiment? a) 328 m/s b) 340 m/s c) 343 m/s d) there is not enough information to tell.

If 25 ml of each of the liquids in the answer choices below were poured into a 100 ml beaker, which would form the top layer? a. sea water – density of 1.024 g/ml b. mineral oil – density of 0.910 g/ml c. distilled water – density of 1.0 g/ml d. petroleum oil – density of 0.820 g/ml