Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing. The frequency of one of the ultrasonic waves is 49.7 kHz. What is (a) the smallest possible and (b) the largest possible value for the frequency of the other ultrasonic wave

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm

What type of nuclear decay causes the atomic number of an element to increase by 1?