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Questions and answers by visitors named ashley --

Questions (51)

When a yellow light shines on a photosensitive metal, photoelectrons are emitted. As the intensity of the light is decreased,
1. 4 answers
2. 2,722 views
An FM radio station broadcasts its signal at a frequency of 9.15 ×107 hertz. Determine the wavelength of the signal in air.
1. 5 answers
2. 2,820 views
When the frequency of a force applied to a system matches the natural frequency of vibration of the system, it starts vibrating
1. 1 answer
2. 631 views
Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the
1. 1 answer
2. 320 views
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
1. 2 answers
2. 751 views
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
1. 3 answers
2. 1,220 views
Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the
1. 4 answers
2. 1,626 views
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
1. 2 answers
2. 710 views
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
1. 1 answer
2. 872 views
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
1. 2 answers
2. 908 views
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
1. 4 answers
2. 2,776 views
Which of the following conditions is not necessary to observe an interference pattern between two sets of waves?Choose one
1. 3 answers
2. 1,103 views
How will the length of the cord influence the period of the pendulum?
1. 1 answer
2. 346 views
How did the American government perceive the relationship between China and the Soviet Union in 1950
1. 3 answers
2. 341 views
to what extent were the soviet union and china collaborators in the North Korean War effort?
1. 1 answer
2. 395 views
How will changing the amplitude of the wave affect the wave speed?
1. 1 answer
2. 414 views
How will changing the frequency of the wave affect the wave speed?
1. 2 answers
2. 521 views
does the frequency of light influences how it is reflected
1. 1 answer
2. 273 views
finding the period of a graph given a equation y=-5sin1/3(x-pi/2)
1. 1 answer
2. 345 views
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
1. 1 answer
2. 379 views
Find the degree measures of 2 angles, one positive and one negative that are co-terminal with 135.
1. 1 answer
2. 431 views
The lengths of 2 adjacent sides of a parallelogram are 42 cm and 36cm. an angle of the parallelogram is 4o degrees. Find the
1. 2 answers
2. 1,303 views
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
1. 1 answer
2. 1,161 views
What is the energy equivalent of 2 e V?
1. 1 answer
2. 358 views
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
1. 2 answers
2. 496 views
When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean
1. 2 answers
2. 578 views
Which of the following confirms the wave nature of particles?a. Photoelectric effect b. Rutherford's alpha scattering experiment
1. 2 answers
2. 820 views
Which of the following is true for the transition of electrons from a higher energy to a lower energy state?Choose one answer.
1. 5 answers
2. 1,015 views
Which of the following is correct for the nuclear fission reaction?Choose one answer. a. The mass of the daughter nucleus is
1. 3 answers
2. 1,195 views
How does the temperature affect the diffraction of light in a mirage ?
1. 2 answers
2. 453 views
How will the frequency of sound change how fast the sound travels?
1. 1 answer
2. 362 views
• How will the amplitude affect the speed of sound?
1. 3 answers
2. 326 views
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
1. 2 answers
2. 590 views
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
1. 2 answers
2. 860 views
Marks: 2The 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
1. 2 answers
2. 665 views
Marks: 2The 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
1. 1 answer
2. 599 views
An observer measures the length of an object. In which of the following cases is the measured length at a minimum?Choose one
1. 2 answers
2. 759 views
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
1. 2 answers
2. 562 views
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
1. 2 answers
2. 1,279 views
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
1. 3 answers
2. 420 views
Jack and Jill blow their whistles at the same time producing sound waves at frequencies of 400 Hz and 404 Hz respectively. How
1. 2 answers
2. 536 views
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
1. 1 answer
2. 449 views
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
1. 4 answers
2. 2,549 views
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
1. 1 answer
2. 457 views
Monochromatic light of wavelength 550 nm passes through a diffraction grating that has 55000 lines/m. A bright line appears on
1. 4 answers
2. 1,305 views
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
1. 2 answers
2. 547 views
Marks: 2Light cannot be linearly polarized by: Choose one answer. a. transmission b. reflection c. diffraction d. scattering
1. 1 answer
2. 440 views
Marks: 5In an experiment conducted using the Young's double-slit apparatus, the separation between the slits is 20 µm. A
1. 1 answer
2. 696 views
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?
1. 1 answer
2. 440 views
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
1. 4 answers
2. 1,723 views
Which of the following statements is not true about resonance?Choose one answer. a. It is easy to get an object to vibrate at
1. 1 answer
2. 679 views

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