Which is the wavelength of a wave that travels at a speed of 3.0 × 108 m/s and has a frequency of 1.5 × 1016 Hz? a.) 2.0 × 10-8 m

b.) 5.0 × 107 m

c.) 2.0 × 108 m

d.)6.0 × 1024 m

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Observations show that interstellar clouds can have almost any shape and