The diffraction grating and the hydrogen spectrum

Physically, what does the 2 corresponded to in the balmer series equation? What does the n correspond to?

Understanding why it is not possible for humans to runs up walls. Complete with a solution diagram.

Why can't a person just walk or run up a wall? What is keeping them from performing this task? Which formula, would best describe what is going on?

Optics

1. A point source of light lies on the central axis of a bi-convex spherical lends who radii of curvature are both measured to be 19.4 cm. The lens is made up of glass with an index of refraction of 1.50 and the source is 3.17 meters to the left of it. What is the image distance (in meters)? 2. A grasshopper sitting 31.4 cm ...continues

Working with circular motion and centripetal acceleration.

There is a hand held device with a rod with a cord attached to a spring scale on the rod. You swing the ball around in a horizontal circle with a radius of 0.500 m. There are several parts to this that I need help with. If the speed of the ball is 3.7 m/s, how do you calculate the expected tension in the cord? Why can't you s ...continues

Debating on whether Pluto is planet or not.

Argue against the fact that Pluto shouldn't be considered a planet.

Why air bubbles in an aquarium get larger as they rise to the surface. Complete with diagrams.

If you observe the movement of fish in an aquarium very carefully you can find that the air bubbles formed due to the breathing increase in size as they ascend to the top surface. Can you explain why?

Air and balloon behaviour and characteristics. Complete with diagrams.

Two balloons one large and the other small, are filled with air. They are inter-connected. Immediately, air flows from the small balloon to the large instead of the other way round [as would be the case of water]. Explain.

Solving the problem when none or very little water is flowing through your tap. Complete with schematic diagrams.

You live in the ground floor of a high rise apartment block. The over head water tanks which supply water to all the apartments are situated on the rooftop. When water flow through the taps in your apartment is low, you go to inspect the water level in the tank on the rooftop. You check the water level in the tank and do the n ...continues

Understanding the principle and workings of the aneroid barometer. Complete with a solution diagram.

Explain the principle of an aneroid barometer by using a schematic diagram or a scale model.

Converting units.

A hot air balloon contains 28 cu.cm of hot air in it. What is this volume expressed in cu. meters? [We come across several instances in our day to day life where it becomes essential to convert units from one system to another]. Mathematically, the problem is as follows: 28 cm^3 = ____ m^3 ?