Ahelium-neon laser (λ=633nm) illuminates a diffraction grating. the distance between the two m=1 bright fringes is 35 cm on a screen 2.5 m behind the grating.

what is the spacing between slits of the grating?

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?