During nuclear decay , a new isotope is created . How is the nucleus of the new isotope different from the parent if the parent isotope has undergone alpha decay ? A) The atomic number decreases by and the mass decreases by 4.

B) The atomic number decreases by 2 and the mass increases by 1.

C ) The atomic number increases by 2 and the mass remains the same.

D) The atomic number remains the same and the mass decreases by 1.

The answer is A because I just did it

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly