Lehigh University Physics 21, Spring 2008
January 7, 2008 Home Work Assignment (1-2)
Note: Solutions to the problems must be submitted on WileyPLUS (www.wileyplus.com). HW-1 due January 16 1-1. (HRW 21-3) A particle of charge charge is 12.0 cm dist
Lehigh University HW-26 Solutions
Physics 21, Spring 2008
April 7, 2008
26-1. (HRW 35-1) The speed of yellow light (from a sodium lamp) in a certain liquid is measured to be . What is the index of refraction of this liquid for the light?
Solution
1. (a) With a understood to mean the magnitude of acceleration, Newton's second and third laws lead to m2 a2 = m1a1
c6.3 10 kghc7.0 m s h = 4.9 10 m =
-7 2 2
-7
9.0 m s
2
kg.
(b) The magnitude of the (only) force on particle 1 is
q q q F = m1
Lehigh University HW-19 Solutions
Physics 21, Spring 2008
March 24, 2008
19-1. (HRW 32-24) Figure 32-35 a shows the current i . that is produced in a wire of resistivity The magnitude of the current versus time t is shown in Fig. 32-35 b. The vert
Lehigh University Physics 21, Spring 2008
April 7, 2008 Home Work Assignment (25-26)
Note: Solutions to the problems must be submitted on WileyPLUS (www.wileyplus.com). HW-25 due April 15 25-1. (HRW 34-107) A fruit fly of height H sits in front of
Lehigh University HW-21 Solutions
Physics 21, Spring 2008
March 26, 2008
21-1. (HRW 33-1) From Fig. 33-2, approximate the (a) smaller and (b) larger wavelength at which the eye of a standard observer has half the eye's maximum sensitivity. What ar
Lecture-17 Examples HW-17-5. (HRW 31-20) An oscillating LC circuit has a current amplitude of 7.50 mA, a potential amplitude of 250 mV, and a capacitance of 220 nF. What are (a) the period of oscillation, (b) the maximum energy stored in the capacito
Lehigh University Physics 21, Spring 2008
April 8, 2008 Home Work Assignment (27-28)
Note: Solutions to the problems must be submitted on WileyPLUS (www.wileyplus.com). HW-27 due April 22 27-1. (HRW 38-7) An ultraviolet lamp emits light of waveleng
Lehigh University
Physics 21 Spring 2008 Equation Sheet
April 12, 2008
1 1 1 = (n - 1) + R R f 2 1
n1 sin 1 = n2 sin 2 S P= c
1 1 1 + = p q f
h2 2 En = 8mL2 n , for n = 1,2,3, K
En = -
me 4 1 , for n = 1,2,3, K 8 o h 2 n 2
Lehigh University HW-25 Solutions
Physics 21, Spring 2008
April 7, 2008
25-1. (HRW 34-107) A fruit fly of height H sits in front of lens 1 on the central axis from the fly; through the lens. The lens forms an image of the fly at a distance the ima
Lecture-26
Blackbody Radiation Wien's Displacement law relates wavelength at maximal emission to temperature as:
P T = 2.90 10-3 mK
Max Planck asserts: i) Emission spectrum from heated surface is same as that from cavity at same temperature; solid
Reading Assignment for Lecture-27
Hydrogen Atom Emission spectrum Bohr's model of hydrogen atom Bohr's energies for orbiting electron de Broglie's hypothesis Bohr's correspondence principle
1
Lecture-26 Examples Example Problem-1 HW26-3. (HRW 35-21) In Fig. 35-39, sources A and B emit long-range radio waves of wavelength 400 m, with the phase of the emission from A ahead of that from source B by 90. The distance rA from A to detector D is
Reading Assignment for Lecture-25
Double-slit interference: Sequence of diffraction and interference Diffraction due to: Square slit; Rectangular slit; Circular aperture; Rayleigh criterion Diffraction grating Polarization of electromagnetic wave
Lecture-23 Geometrical Optics - continued
Lensmaker's equation
Snell's law gives
and
1 n 2 4 n 3
Parallel lines
R2
h1 1 sin 1 = ; R1 h h2 ; and 2 R2 f Also from figure, we
R1
have
= 1 - 2
= 3 - =
Or,
4
n
- ( 1- 2) =
n
+
n
Lecture-23 Examples Solutions HW-23-5. (HRW 34-33) In Fig. 34-38, a beam of parallel light rays from a laser is incident on a solid transparent sphere of index of refraction n. (a) If a point image is produced at the back of the sphere, what is the i
Lecture-24 Examples Example Problem-1 HW-24-4. (HRW 34-98) In Fig. 34-50, an object is placed in front of a converging lens at a distance equal to twice the focal length f1 of the lens. On the other side of the lens is a concave mirror of focal lengt
Lecture-24 Physical Optics Wave-like effects
Demonstration Interference Two Huygens wavelets overlap and add to create spatial modulation of intensity. Interference
Question: How does it work?
Note: Light detectors including eyes respond to inten
Lehigh University HW-23 Solutions
Physics 21, Spring 2008
April 2, 2008
23-1. (HRW 33-67) In Fig. 33-65, light enters a 90 triangular prism at point P with incident angle , and then some of it refracts at point Q with an angle of refraction of 90.
Lehigh University HW-24 Solutions
Physics 21, Spring 2008
April 2, 2008
24-1. (HRW 34-43) You produce an image of the Sun on a screen, using a thin lens whose focal length is 20.0 cm. What is the diameter of the image? (See Appendix C for needed d
Reading Assignment for Lecture-23
Polarization of Electromagnetic Waves Geometrical Optics Lenses Lensmaker's equation Thin lens equation Focusing Imaging by ray tracing Magnification Imaging examples: Telescope, microscope, human eye Total intern
Lehigh University HW-22 Solutions
Physics 21, Spring 2008
March 26, 2008
22-1. (HRW 33-24) A small laser emits light at power 5.00 mW and wavelength 633 nm. The laser beam is focused (narrowed) until its diameter matches the 1266 nm diameter of a
Lecture-22
Wavefront is instantaneous surface of uniform phase. For wave propagating in one direction, the wavefront is planar. In three-D space, the wavefront is spherical in shape. Wavefront is perpendicular to direction of wave propagation.
Plana
Lecture-22 Examples Solutions HW 22-4. (HRW 33-51) In Fig. 33-53, a 2.00-m-long vertical pole extends from the bottom of a swimming pool to a point 50.0 cm above the water. Sunlight is incident at . What is the length of the shadow of the angle pole
Lehigh University Physics 21, Spring 2008
April 2, 2008 Home Work Assignment (23-24)
Note: Solutions to the problems must be submitted on WileyPLUS (www.wileyplus.com). HW-23 due April 8 23-1. (HRW 33-67) In Fig. 33-65, light enters a 90 triangular
Physics 21 Hour Exam II
Closed note, multiple-choice exam,
covering ALL materials since HE-I
Time: Tuesday, April 1 9:20-10:10 AM Place:
Venue A: Lewis Lab Rm 270
Recitation-3; Recitation-5; Recitation-6; Recitation-7; and Recitation-8
Venue B: Sin
Lecture-16
We have
Oscillation in LC circuit without resistor
Electric energy in Capacitor: Magnetic energy in Inductor:
q2 UE = 2C 1 U B = Li 2 2
In absence of any resistor in circuit, charge (q) initially stored in C drives current (i) in circu