# Physics Assignments Homework

## Interference from Thin Films

Interference from Thin Films The colors we see when sunlight illuminates a soap bubble or an oil slick are caused by the interference of light waves’ reflected from the front and back surfaces of a thin transparent film. The thickness of the soap or oil film is typically of the order of magnitude of the wavelength of the …

## Proof of Equation

Proof of Equation We are now in a position to derive Eq. ), the equation for the late magnification of an object reflected in a mirror.  Consider ray b.t reflected at point c so that the incident and reflected rays make equal angles withe axis of the mirror at that point.The two right triangles abc and dec …

## PROBLEM SOLVING TACTICS

PROBLEM SOLVING TACTICS TICtic 2: ldentifying SHM In linear SHM the acceleration a and displacement x of the system lire related by an equation of the form a ‘” -: (a positive constant)x, which says that the acceleration is proportional to the displacement from the equilibrium position but is in the opposite direction. Once you find such an expression for …

## Sample Proinem

Sample Proinem At r = 0, the displacement x(O) of the block in a linear oscillator like that of Fig. 16-5 is -8.50 em, (Read x(0) IS “x at time zero.”) The block’s velocity v(\l} then is -0.920 mIs, and its acceleration 0(0) is +47.0 m/s2• .(a) What is the angular frequency w of this system? SOLUTIONA: Key Ideahere is …

## LC Oscillations Qualitatively

LC Oscillations. Qualitatively Of the three circuit elements, resistance R, capacitance C, and inductance L, we have so far discussed the series combinations RC (in Section 28·8) and-RL (in Section 31·9). In these two kinds of circuit we found that the charge, current, and potential  difference grow and decay exponentially. The time scale of the growth or …

## Unit of quantity of electricity. The coulomb

Unit of quantity of electricity. The coulomb An electric current in a wire is a drift of electrons and the quantity of electricity which passes any point in a circuit will depend on the strength of the current and the time for which it flows. The unit of quantity of electricity is called the coulomb. A coulomb …

## Why ice is slippery

Why ice is slippery The ease with which a skater glides over the ice depends on the formation of a thin film of water between the blade of the skate and the ice. At one time this was generally believed to be caused by melting under pressure. However, a simple calculation shows that the pressure exerted by …

## Capillary attraction

Capillary attraction If a piece of ordinary glass tubing is heated in a gas flame until it softens it may be crawn out into a tube of very fine bore. This is called a capillary tube (from the Latin capilla = hair). On dipping the tube into water, alcohol, or any other liquid which wets glass it …

## CONTINUOUS SPECTRA

CONTINUOUS SPECTRA Line spectra are emitted by matter in the gaseous state. in which the atoms are so far apart that interactions between them are negligible and each atom bebaves as an isolated system. Hot matter in condensed states (solid or liquid) nearly always emits radiation with a continuous distribution of wavelengths rather than a line spectrum. An …

## THIN LENSES

THIN LENSES The most familiar and widely used optical device (after the plane mirror) is the lens. A lens is an optical system with two refracting surfaces. The simplest lens has two spherical surfaces close enough together that we can neglect the distance between them (the thickness of the lens); we call this a thin lens. If you …