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3 years ago

Hurry Please !!!!! Study the diagram Point C identifies the____ of the wave

Physics

1 answer:

Nata [24]3 years ago

4 0

Answer: Trough

Explanation: The point labeled C in the wave diagram above is the TROUGH of the wave motion. The trough of a wave motion identifies or signifies the point of least or minimum Displacement by measuring the downward Displacement of the wave. The point A is the CREST which is the opposite of the trough, signifying the point of maximum or upward Displacement of the wave cycle.

Point B is the wave amplitude which signifies the maximum extent of vibration from the equilibrium position of a wave. The point labeled D refers to the wavength of the wave motion which is the distance between successive crest or troughs of a wave motion.

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A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 11 mA , and th

zimovet [89]

Answer:

3.73 * 10^16 photons/sec

Explanation:

power supply = 3.0 V

Emits 440 nm blue light

current in LED = 11 mA

efficiency of LED = 51%

<u>Calculate the number of photons per second the LED will emit </u>

first step : calculate the energy of the Photon

E = hc / λ

=( 6.62 * 10^-34 * 3 * 10^8 ) / 440 * 10^-9

= 0.0451 * 10^-17 J

Number of Photon =( power supply * efficiency * current ) / energy of photon

= ( 3 * 0.51 * 11 * 10^-3 ) / 0.0451 * 10^-17

= 3.73 * 10^16 photons/sec

3 0

3 years ago

Which best compares the gravitational force and the strong force ?

Elan Coil [88]

<span>The heavier the body is, the stronger its gravitational pull. Example, the Milky Way Galaxy has a gravitational pull because of the heavenly bodies such as stars and planets are surrounding it. A strong force is exerted if the mass of another body is bigger than the other body.</span>

8 0

3 years ago

Read 2 more answers

Near the surface of Earth, an electric field points radially downward and has a magnitude of approximately 100 N/C. 1) What char

scoundrel [369]

Answer:

$-2.50\times10^{-4} \text{ C}$ or -0.000250 C

Explanation:

The field points downward, which is the direction of a positive charge. In order for the penny to rise, it has to have a negative charge since its direction is opposite that of the field.

To calculate the magnitude of the charge:

The penny is to accelerate upward so it must overcome gravity. Hence, the net force to cause it to accelerate it upward is the difference between the electrostatic force and its weight.

$F_N = F_E - W$

$F_E = F_N + W$

$F_E = ma + mg$

$F_E = m(a + g)$

$F_E = 0.0025(0.19+9.8)$

$F_E = 0.0025\times9.99$

Now, the electric field intensity is given by

$F_E = E \times q$

where q = charge

$q=\dfrac{F_E}{E}$

$q=\dfrac{0.0025\times9.99}{100}=0.00024975= 0.000250$ to 3 significant figures.

In standard form, q = $-2.50\times10^{-4} \text{ C}$ The negative sign indicates it has a negative charge, as explained initially.

5 0

3 years ago

If the boy and his bike actually had a mass of 40 kg instead of 50 kg how much force would it take for him to accelerate at 0.8

klio [65]

Answer:

F = 32 [N]

Explanation:

To solve this problem we must use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.

∑F = m*a

where:

F = forces applied [N] (units of Newtons)

m = mass = 40 [kg]

a = acceleration = 0.8 [m/s²]

Now replacing:

$F=m*a\\F = 40*0.8\\F = 32 [N]$

8 0

3 years ago

An object of mass 300 kg is observed to accelerate at the rate of 4 m/s2. Calculate the force required to produce this accelerat

garik1379 [7]

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 300 × 4

We have the final answer as

Hope this helps you

4 0

3 years ago