(Mon) What beat frequency is heard when two tuning forks having frequencies of 435 Hz and 432 Hz are placed next to each other? (5 min / 6 pts)

(Mon) What beat frequency is heard when two tuning forks having frequencies of 435 Hz and 432 Hz are placed next to each other? (5 min / 6 pts)

Beat frequency = high frequency – low frequency

Beat frequency = 435 Hz – 432 Hz

Beat frequency = 3 Hz

(Tue) The speed of light in a vacuum is 300,000,000 m/s. The speed of light in the acrylic block we used in the lab is 176,000,000 m/s. What is the index of refraction in an acrylic block? (5 min / 6 pts)

(Tue) The speed of light in a vacuum is 300,000,000 m/s. The speed of light in the acrylic block we used in the lab is 176,000,000 m/s. What is the index of refraction in an acrylic block? (5 min/6 pts)

n = (300,000,000 m/s)/(176,000,000 m/s)

n = c/v

c

n v

∕=

n = 1.70 3x108 m/s

1.76x108 m/s

or: nv = c

(Wed) End of Wave Quiz – No Warm Up Today

(Thu) A sound wave traveling through a solid material has a frequency of 500 Hz. The wavelength of the sound is 2 m. What is the speed of sound in the material? (5 min / 6 pts)

(Thu) A sound wave traveling through a solid material has a frequency of 500 Hz. The wavelength of the sound is 2 m. What is the speed of sound in the material? (5 min / 6 pts)

v = f x λ

v = 500 Hz x 2 m

v = 1000 m/s

V

f λx

=500 Hz

2 m

v = 500 (1/sec) x 2 m

(Fri) A Carbon atom has 6 protons and 6 electrons in each atom and does not have a charge. If you remove 2 of the electrons from the atom, what particles will exist and how big will the charge be on each particle? (5 min / 8 pts)

(Fri) A Carbon atom has 6 protons and 6 electrons in each atom and does not have a charge. If you remove 2 of the electrons from the atom, what particles will exist and how big will the charge be on each particle? (5 min / 8 pts)

Particles

1 - Positive Ion

2 - Negative Ions

Charge

+2 C.U.

-1 C.U on each

End of Week Procedures

1.Add up all the points you got this week

2.Put the total number of points out of 26 points you earned at the top of your page (no total, lose 5 points)

3.List any dates you were absent or tardy (and why)

4.Make sure your name and period # is on the top of the page (no name, no credit)

5.Turn in your papers

(Thu) The astronauts were recently working on the International Space Station. If one banged a metal wrench against a metal part of the station, would another astronaut not in the space station hear it (Yes or No)? Explain your answer using what you know about what type of wave a sound wave is. (5 min / 8 pts)

(Thu) The astronauts were recently working on the International Space Station. If one banged a metal wrench against a metal part of the station, would another astronaut not in the space station hear it (Yes or No)? Explain your answer using what you know about what type of wave a sound wave is. (5 min / 8 pts)

No they wouldn’t hear it

Why:

1. Sound is a mechanical wave

2. Mechanical waves need a medium to travel through (air)

3. There isn’t any air in space so sound waves won’t travel