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3 years ago

A beam of red light and a beam of blue light have exactly the same energy. Which beam contains the greater number of photons?

1 answer:

4 0

The higher the frequency, the more energy the photon has. Of course, a beam of light has many photons. This means that really intense red light (lots of photons, with slightly lower energy)

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What is the force of a 13kg ball that has been dropped and has fallen for 1 second?

ankoles [38]

Answer:

127.4 newtons

Explanation:

Assuming g = 9.8:

F = ma = 13(9.8) = 127.4 N

6 0

3 years ago

Three batteries are connected in series so that the total voltage is 54 volts. The voltage of the first battery is twice the vol

Alex_Xolod [135]

Answer:

$v_1 = 12 volts$

$v_2 = 6 volts$

$v_3 = 36 volts$

Explanation:

As we know that all the batteries are in series

so the net voltage of all three batteries is given as

$V = v_1 + v_2 + v_3$

now we know that

$v_1 = 2v_2$

$v_1 = \frac{1}{3}v_3$

now plug in all the values in it

$54 = v_1 + \frac{v_1}{2} + 3v_1$

$54 = 4.5 v_1$

$v_1 = 12 volts$

now we have

$v_2 = 6 volts$

$v_3 = 36 volts$

3 0

3 years ago

Drag and drop the terms at the left to match the appropriate descriptions at the right. ResetHelp Visual acuity Emmetropia Accom

Lubov Fominskaja [6]

Answer: Visual acuity: sharpness of vision.

Myopia: nearsightedness

Refraction: bending of light rays.

Emmetropia: normal vision.

Accommodation: changes the shape of the eye lens to focus light on the retina.

Presbyopia: age-related farsightedness due to loss of elasticity in the lens.

Astigmatism: reduction in visual acuity due to changes in the cornea or lens.

Hyperopia: farsightedness

Myopia and hyperopia are refractive errors of the eye.

Presbyopia occurs in old age people.

Explanation:

Visual acuity: It can be defined as the inability to observe the details of shape of the object. Person loses sharpness in vision.

Myopia: It is a defect in vision in which person is able to observe the near by objects clearly but not able to see the distant objects.

Refraction: It can be defined as the bending of beam of light when it passes through from one substance to another.

Emmetropia: It is a vision without any defect.

Accommodation: It is the ability of the eye to adjust its focal length and adjusting the light on focus.

Presbyopia: It can be defined as the loss of ability of eye to focus on the object. It occurs in old age.

Astigmatism: It is a refractive error in which the eye does not focus light on retina.

Hyperopia: It is also called as farsightedness. Distant objects can be seen clearly but nearby appears blurry.

5 0

3 years ago

What is the electric force on a proton 2.5 fm from the surface of the nucleus? hint: treat the spherical nucleus as a point char

Whitepunk [10]

In this case, you need the formula below where:

F = force
k = coulombs constant 8.99 x10^{9} N.m^{2} . C^{-2}
q1 = electric charge 1
q2 = electric charge 2
r = the distance between the charges

$F = k((q1.q2)/r^{2})$

pls note: make sure your units are correct (in meters etc, not fm (<em>femto-meters</em>)).

Curiously, this question doesn't tell you what atom you are next to the nucleus of. Different numbers of protons in the nucleus of the atom will make for vastly different forces in your answer...

6 0

4 years ago

Liang is warming a pot of soup on the stove.How is the motion of the particles in the soup different after the temperature of th

julsineya [31]

The particles will move faster due to the increased energy from the heat.

4 0

3 years ago