ashley --

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?

14 years ago

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?

14 years ago

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 le...

14 years ago

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...

14 years ago

How will the length of the cord influence the period of the pendulum?

14 years ago

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.

14 years ago

How did the American government perceive the relationship between China and the Soviet Union in 1950

14 years ago

to what extent were the soviet union and china collaborators in the North Korean War effort?

14 years ago

How will changing the amplitude of the wave affect the wave speed?

14 years ago

How will changing the frequency of the wave affect the wave speed?

14 years ago

does the frequency of light influences how it is reflected

14 years ago

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

14 years ago

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

14 years ago

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.

14 years ago

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

14 years ago

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.

14 years ago

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?

14 years ago

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

14 years ago

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...

14 years ago

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 paren...

14 years ago

How does the temperature affect the diffraction of light in a mirage ?

14 years ago

How will the frequency of sound change how fast the sound travels?

14 years ago

• How will the amplitude affect the speed of sound?

14 years ago

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 tim...

14 years ago

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 spa...

14 years ago

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...

14 years ago

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

14 years ago

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

14 years ago

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

14 years ago

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

14 years ago

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...

14 years ago

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

14 years ago

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

14 years ago

how u get that

14 years ago

nothin happens

14 years ago

is it b

14 years ago