A fluorescent light "hums" at 120 Hz. A bored grad student hums at 118.4 Hz. What...
A 15-W compact fluorescent light bulb is used in a lamp plugged into a 120-V wall socket. You can assume the lamp itself has zero resistance. Find (a) the resistance of the light bulb, (b) the maximum current through the bulb, and (c) the maximum power used by the light bulb. Also, if the frequency of the electricity is the typical household value of f = 60 Hz, what are the first two times that the current going through the...
7. A student finds experimentally that resonance occurs for a particular closed tube at a frequency of 120 Hz. List two other frequencies at which resonance should occur for this tube. (Hint: Assume the student found the fundamental) 8. Initially unpolarized light, with an intensity of ., is sent through 2 polarizing sheets whose polarizing directions are an angle 0 20° to one another. How much intensity will the light have if the after it passes through both polarizers? 9....
-- way is the true value 120 Hz! What is the meaning of NODE in waves! What is the frequency of war
Krishna and Seldon now try a homework problem. A policeman sitting in his unmarked police car sees an approaching motorcyclist go through a red light two blocks away. He turns on his siren at a frequency of 1000 Hz as the motorcyclist heads directly toward him at 51 mph (22.80 m/s). What frequency does the motorcyclist hear? (Enter your answer to at least the nearest integer. Assume the speed of sound in air is 331 m/s.) What frequency does the...
One foggy morning, when the temperature of t he air was 19 degrees calcius, Kenny is driving his speed boat toward the Brant Point Lighthouse at a speed of 15 m/s as the fog horn blows with a frequency of 180 Hz. What frequency does Kenny hear as he moves?
Please explain and show how to do the exercise (at the bottom), parts b and c. Explain what you are substituting in the Doppler equations and why. Also please explain what signs you have to use. EXAMPLE 14.11 Sour Notes Goal Apply the beat frequency concept. Problem A certain piano string is supposed to vibrate ning, what beat frequency is observed by the assistant? at a frequency of 4.40 X 102 Hz. To check its frequency, Note: Assume all numbers...
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 464 Hz when the train is approaching him and 441 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find? (Assume the speed of sound in air is 343 m/s.)
2006) Problem 4: A student knows that an ambulance siren has a frequency of,, 396 Hz. He measures, when the ambulance is approaching him, the frequency fo 417 Hz. Assume the speed of sound is 343 m/s in this problem. 33% Part (a) Input an expression for the ambulance's speed v in terms of the frequencies and the speed of sound , Grade Summary Deductions Potential10 Submissions Attempts remaining (3% per attempt) detailed view 1 2 3 0. Submit Hint...
Question 1 Light of wavelength 468 nm has what frequency (in Hz)? •Blackboard excepts "E" but not "e" for exponential notation, for example 0.000043 could be entered as 4.3E-5 . . 1 points Question 2 Which of the following best summarizes how a photoelectric detector provides an energy measurement: As light of one color falls on the detector, it ejects electrons that charge a capacitor. We measure the voltage of the capacitor, and infer the energy, with a multimeter. As...
Dolphins emit sound bursts that range in frequency from 1 Hz to 120 kHz. Say that a dolphin is using a sound burst consisting of these frequencies as a form of sonar, like bats. Let the burst last for a time interval of 10 ms, after which it listens for 100 ms. Say that the logarithmic intensity (loudness) of the dolphin's sound is 50 dB as measured at 1 m away. Dolphins can hear sounds that are 2 dB below...