Monday
October 20, 2014

Posts by ashley --


Total # Posts: 54

physics
Which of the following statements is not true about resonance? Choose one answer. a. It is easy to get an object to vibrate at its resonant frequencies but difficult to get it vibrate at other frequencies. b. A simple pendulum has many resonant frequencies called harmonics. c...
April 30, 2011

physics
What is the critical angle of light traveling from benzene (n=1.501) into air? Choose one answer. a. 40.05o b. 48.22o c. 41.78o d. 62.63o
April 30, 2011

physics
What is the angle of refraction of a light ray that enters the surface of a calm lake from air at an angle of 45o to the normal? The refractive index of water is 1.333. Choose one answer. a. 32.04o b. 45.00o c. 59.99o d. 33.76o
April 30, 2011

physics
Marks: 5 In an experiment conducted using the Young's double-slit apparatus, the separation between the slits is 20 µm. A first-order constructive interference fringe appears at an angle of 2.5o from the zeroth order (central) fringe. A. What wavelength of light is ...
April 30, 2011

physics
Marks: 2 Light cannot be linearly polarized by: Choose one answer. a. transmission b. reflection c. diffraction d. scattering
April 30, 2011

physics ---- really dnt get this at all
The third harmonic of a guitar string has a frequency of 170 Hz. What is the length of the guitar string if the speed of the waves on the string is 125 m/s? Choose one answer. a. 1.103 m b. 2.206 m c. 0.368 m d. 2.040 m
April 30, 2011

physics
Monochromatic light of wavelength 550 nm passes through a diffraction grating that has 55000 lines/m. A bright line appears on the screen at an angle of 12.23o from the central bright fringe. What is the order of this bright line? Choose one answer. a. 5 b. 6 c. 7 d. 8
April 30, 2011

physics ---- really dnt get this at all
A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance? Choose one answer. a. -21.4 cm b. 21.4 cm c. 65 cm d. 35 cm
April 30, 2011

physics
What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? Choose one answer. a. -13.3 cm b. 13.3 cm c. -40.0 cm d. 40.0 cm
April 30, 2011

physics
What is the magnification of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? Choose one answer. a. 0.33 b. -0.33 c. 1.33 d. -1.33
April 30, 2011

physics
Jack and Jill blow their whistles at the same time producing sound waves at frequencies of 400 Hz and 404 Hz respectively. How many beats per second are heard from the superposition of the two waves? Choose one answer. a. 400 b. 404 c. 4 d. 8
April 30, 2011

physics
What is the critical angle of light traveling from benzene (n=1.501) into air? Choose one answer. a. 40.05o b. 48.22o c. 41.78o d. 62.63o
April 30, 2011

physics
The period of a simple pendulum is measured to be 4.0 seconds in a frame of reference. Which of the following is correct when the period of the pendulum is measured by an observer moving with 0.4 times the speed of the light? Choose one answer. a. The time period of the ...
April 30, 2011

physics
If an observer is traveling parallel to a rod at twice the speed of the rod, what is does the observer perceive the length to be? Choose one answer. a. The length of the rod remains the same. b. The length of the rod will become twice its original value. c. The length of the ...
April 30, 2011

physics
An observer measures the length of an object. In which of the following cases is the measured length at a minimum? Choose one answer. a. The observer and the object move with the same speed v in the same direction. b. The observer and the object move with the same speed v in ...
April 30, 2011

physics
Marks: 2 The time taken by the space craft moving at a speed equal to half the velocity of light to go from star A to star B is 2 years as calculated at the Earth station. Which of the following is correct for the time measured by the astronaut in the space craft to reach the...
April 30, 2011

physics
Marks: 2 The time taken by the space craft moving at a speed equal to half the velocity of light to go from star A to star B is 2 years as calculated at the Earth station. Which of the following is correct for the time measured by the astronaut in the space craft to reach the...
April 30, 2011

physics
The period of a simple pendulum is measured to be 4.0 seconds in a frame of reference. Which of the following is correct when the period of the pendulum is measured by an observer moving with 0.4 times the speed of the light? Choose one answer. a. The time period of the ...
April 30, 2011

physics
If an observer is traveling parallel to a rod at twice the speed of the rod, what is does the observer perceive the length to be? Choose one answer. a. The length of the rod remains the same. b. The length of the rod will become twice its original value. c. The length of the ...
April 30, 2011

physics
• How will the amplitude affect the speed of sound?
April 29, 2011

physics
How will the frequency of sound change how fast the sound travels?
April 29, 2011

physics
How does the temperature affect the diffraction of light in a mirage ?
April 29, 2011

physics
Which of the following is correct for the nuclear fission reaction? Choose one answer. a. The mass of the daughter nucleus is always greater than the mass of the parent nucleus. b. The mass of the daughter nucleus is always less than the mass of the parent nucleus. c. The mass...
April 28, 2011

physics
is it b
April 28, 2011

physics
nothin happens
April 28, 2011

physics
Which of the following is true for the transition of electrons from a higher energy to a lower energy state? Choose one answer. a. The greater the energy difference between the levels, the more is the wavelength of the photons emitted. b. The greater the energy difference ...
April 28, 2011

physics
Which of the following confirms the wave nature of particles? a. Photoelectric effect b. Rutherford's alpha scattering experiment c. de Broglie waves d. Young's double slit experiment
April 28, 2011

physics
When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position?
April 28, 2011

physics
A water wave is generated in a ripple tank by an oscillator that vibrates 50 times in 30 seconds. A given trough of the wave travels 50.0 cm in 15 seconds. What is the wavelength of the water wave? Produce all your workings.
April 28, 2011

physics
When a yellow light shines on a photosensitive metal, photoelectrons are emitted. As the intensity of the light is decreased, the number of photoelectrons emitted per second
April 28, 2011

modern physics
What is the energy equivalent of 2 e V?
April 28, 2011

physics ---
A concave spherical mirror has a radius of curvature 15 cm. A 1 cm tall bulb is placed in front of the mirror such that its image is formed 10 cm in front of the mirror. If you measure distance from the optic center of the mirror, (A) What is the focal length of the mirror? (B...
April 27, 2011

trig
The lengths of 2 adjacent sides of a parallelogram are 42 cm and 36cm. an angle of the parallelogram is 4o degrees. Find the measure of the longest diagonal to the nearest tenth of a centimeter.
April 26, 2011

trig.
how u get that
April 26, 2011

trig.
Find the degree measures of 2 angles, one positive and one negative that are co-terminal with 135.
April 26, 2011

trig
Each child in a family of 3 children is going to get a pet. One wants a dog or cat, another wants a bird or rabbit, and the third wants a frog or snake. List a sample space or draw a tree diagram and determine the number of possible outcomes.
April 26, 2011

trig
finding the period of a graph given a equation y=-5sin1/3(x-pi/2)
April 26, 2011

physics
does the frequency of light influences how it is reflected
April 23, 2011

physics
How will changing the frequency of the wave affect the wave speed?
April 21, 2011

physics
How will changing the amplitude of the wave affect the wave speed?
April 21, 2011

US history
to what extent were the soviet union and china collaborators in the North Korean War effort?
April 20, 2011

US history
How did the American government perceive the relationship between China and the Soviet Union in 1950
April 20, 2011

physics
An FM radio station broadcasts its signal at a frequency of 9.15 ×107 hertz. Determine the wavelength of the signal in air. Round your answer to the nearest hundredth of a meter.
April 18, 2011

physics
How will the length of the cord influence the period of the pendulum?
April 17, 2011

physics
Which of the following conditions is not necessary to observe an interference pattern between two sets of waves? Choose one answer. a. The waves must have the same wavelength. b. The waves must have a constant phase difference. c. The waves must have the same amplitude. d. ...
April 17, 2011

physics
A concave spherical mirror has a radius of curvature 15 cm. A 1 cm tall bulb is placed in front of the mirror such that its image is formed 10 cm in front of the mirror. If you measure distance from the optic center of the mirror, (A) What is the focal length of the mirror? (B...
April 17, 2011

physics
The sixth harmonic of a 70 cm long guitar string has a frequency of 557.14 Hz. What is the velocity of sound in the guitar string?
April 17, 2011

physics
Where should the birthday candle of height 5 cm be placed in front of a convex lens of focal length 15 cm so that a real image will be formed at a distance of 25 cm from the lens? What is the height of this image?
April 17, 2011

physics
The sixth harmonic of a 70 cm long guitar string has a frequency of 557.14 Hz. What is the velocity of sound in the guitar string?
April 17, 2011

physics
Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain?
April 17, 2011

physics
What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s
April 17, 2011

physics
The intensity of sound is x W/m2 at a distance of 5 m from the source. What is the intensity of the sound at a distance of 20 m from the source?
April 13, 2011

physics
Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain?
April 13, 2011

physics
When the frequency of a force applied to a system matches the natural frequency of vibration of the system, it starts vibrating with a: (I believe its larger amplitude)
April 13, 2011

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