Calculate the displacement amplitude (in m) of a 20 kHz sound wave in helium if it has a pressure amplitude of 8.0 × 10^?3 N/m2 . (? = 0.179 kg/m3, v = 972 m/s.)

a. 2.9 × 10^?10
b. 3.7 × 10^?10
c. 7.8 × 10^?9
d. 2.4 × 10^?9
e. 1.9 × 10^?10


b

Physics & Space Science

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If an electron has a measured wavelength of 0.832 × 10^?10 m, what is its kinetic energy? (h = 6.63 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 J, and me = 9.11 × 10^?31 kg)

a. 7640 eV b. 418 eV c. 334 eV d. 218 eV e. 70 eV

Physics & Space Science

An engineer uses a river (minimum temperature to cool his electrical plant which heats water with a boiler operating at His boiler uses 420 kW of energy to heat water to steam. What is the maximum power output under ideal circumstances?

A. 230 kW B. 186 kW C. 330 kW D. 416 kW

Physics & Space Science

When rolled down a mountainside at 7.0 m/s, the horizontal component of its velocity vector was 1.8 m/s. What was the angle of the mountain surface above the horizontal?

A) 15° B) 75° C) 33° D) 57 °

Physics & Space Science

The ____ is responsible for binding the electrons to the nucleus

a. Kirchhoff's law b. ground state c. temperature d. Coulomb force e. Balmer series

Physics & Space Science