What is the difference between muscular endurance and muscular strength?
A. Muscular strength refers to the amount of force in one effort, while muscular endurance refers to performing repeated movements.
B. Muscular strength refers to the ability to move joints, while muscular endurance refers to the efficiency of oxygen delivery to cells.
C. Muscular endurance refers to the amount of force in one effort, while muscular strength refers to performing repeated movements.
D. Muscular endurance refers to the efficiency of oxygen delivery to cells, while muscular strength refers to the ability to move joints.

A: Muscular strength refers to the amount of force in one effort, while muscular endurance refers to performing repeated movements.

Explanation:

Muscle Strength is the ability to exert a maximal amount of force for a short period of time.

Muscle Endurance is the ability to do something over and over for an extended period of time without getting tired.

Example of Muscle Strength in the gym: Doing 1 rep of a  220 pound squat.

Example of Muscle Endurance in the gym: Doing 50 100 pound squats in a row, moving to a rhythm.

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.