At the crest (antinode), constructive interference takes place. 82. ANS: Sound is produced by the vibration of an object. The vibrating object collides with nearby molecules transferring energy to them. These molecules collide with other molecules transferring the sound through the medium.
-Medium range frequencies can be heard at lower intensities. Sound at low frequencies (below 50 Hz) and high frequencies (above 12,000 Hz) must relatively intense in order to be heard. -Intensity and distance have an inverse square relationship. formula: P/4πr2 -Frequency determines pitch and intensity (amplitude) determines volume. relative intensity-relates the intensity of a given sound to the intensity at the threshold of hearing (decibel level); a difference in 10 dB means the sound doubles forced vibrations-when vibrations are transferred from one object to another natural frequency-frequency at which something vibrates resonance-when the frequency of a force matches the natural frequency of vibration of a system; sound will transfer at a greater intensity Section 13-3: Harmonics -In a vibrating string, a variety of standing waves can occur (two waves of the same frequency, wavelength, and amplitude travel in opposite directions and
Which of the following is a general trend for the ionization energy of elements in the periodic table? a. increases from left to right; increases from bottom to top b. increases from left to right; decreases from bottom to top c. decreases from left to right; increases from bottom to top d. decreases from left to right; decreases from bottom to top e. none of the above 60. Which of the following groups of elements has the highest ionization energy? a. Group IA/1 b.
(57.10) 7 in. 3. What friction rate should be used to size a duct for a static pressure drop of 0.1 in wc if the duct has total equivalent length of 50 ft? (57.10) 0.2 4. What size metal duct should be used to deliver 270 CFM with a pressure drop of 0.15 in wc if the total equivalent length is 80 ft?
According to the seismogram shown in the figure, which wave is the fastest? [pic] a. Tidal wave b. Surface wave [pic] c. P-wave d. S-wave 15. What is the study of earthquakes
Which would have the longer wavelength, light with a frequency of 4.5 X 1014 Hz or light with a frequency of 6.19 X 1014 Hz? (4.5 X 1014 Hz) ______________12. Find the frequency of light if its wavelength is 7.3 X 105 5 picometers. (4.1 X 1014 Hz) ______________13. Find the wavelength in centimeters of light whose frequency is 7.00 X 1016 Hz.
The expression of 5008 km in scientific notation is ____. |a. |5.008 [pic] 10[pic] km |c. |5.008 [pic] 10[pic] km | |b. |50.08[pic] 10[pic] km |d.
Its two main functions are data link layer’s connection to the network layer above it done by the sub-layer (logic layer Control (LLC)) and second function being done by the sub-layer MAC- Media access control which controls the physical hardware. Question 10: Describe four types of noise. Which is likely to pose the greatest problem to network managers? Four types of noise; White noise; is the background hiss or static on radios and telephones) is caused by the thermal agitation of electrons and therefore is inescapable. Impulse noise; is heard as a click or a crackling noise and can last as long as 1/100 of a second.
It can actually heat the lead used in the older models. This could cause cardiac tissue damage in patients. The lead acts as a conductor to the radio frequency energy. The studies have shown a wide range in heating after an MRI. (Ahmed, et al., 2013) The gradient magnetic field comes about by the actual process of the MRI.
3. How many moles of hydrogen gas can be produced when 10.0 g of Zn react with 50.0mL of 2.0M HCl? 4. If the pressure is 1.2 atm and the temperature is 20.0ºC, what volume of hydrogen is produced in prelab question #3? Procedure: 1.