All categories

4 years ago

Which two ways can light be understood

1 answer:

3 0

Around 1700, when Mechanics was made for the first time by Sir Isaac Newton, he said about the nature of the light that it resembles thiny particles. Somewhat latter , around 1865, Maxwell discovered that the Electromagnetic waves have the same speed as the speed of light. From this resemblance he deduced that light should be an Electromagnetic wave. Latter than this, at around 1900, when trying to explain some peculiarities of the Photoelectric effect, Eistein postulated that light behaves like thiny particles (the older Newton Theory from 1700).
Today we say that LIGHT HAS A DUAL CHARACTER. It is also a wave and a particle. In some experiments light behaves like an Electromagnetic wave (diffraction, reflection, refraction), in other experiments light behaves like thiny particles (quanta): the Photoelectric effect and the Compton effect.

You might be interested in

What are the three longest wavelengths for standing sound waves in a 121-cm-long tube that is (a) open at both ends and (b) open

irina [24]

Answer:A)For open pipe

1stπ=484cm

2nd wavelength=161.3cm

3rd is=96.8cm

B)For closed pipe

1st wavelength=242cm

2nd=121cm

3rd wavelength=80.7cm

Explanation:

An open pipe produces a standing waves whose wavelength is related to it's length(length of pipe) by nL/4=π ,where n represent odd integers 1,2,3...

So the first note called fundamental note or 1st Harmonic is L=π/ 4,121=π/ 4

π= 121×4=484cm

Third harmonic,L=3π /4

So π= 4l/3=4×121/3=161.3cm

The 3rd wavelength is

Fifth harmonic=

π =4l/5=4×121/5=96.8cm

For a pipe open at one end and closed at the other also called closed pipe

Fundamental note is

2L/n= π where n=1,2,3....ie integers

First wavelength

π=2L=2×121=242cm

Second wavelength

π=L=121cm

Third is

π=2L/3=2×121/3=80.7cm

3 0

3 years ago

The pressure required for metamorphism can be generated by

Lana71 [14]

Pressure from the weight of overlying rock

3 0

3 years ago

an open cart is moving along a straight frictionless horizontal track. When rain starts falling vertically into the cart, what h

fgiga [73]

Answer:

The speed of the cart decreases

Explanation:

The track is frictionless, so we can consider the cart as isolated system (no external forces acting on it): therefore, the momentum of the cart is conserved

$p=mv=const.$

where m is the mass and v the speed of the cart.

When it starts raining, some water falls into the cart: this means that the mass of the cart, m, increases. But we said that the momentum, p, must remain constant: in order for that to happen, this means that the speed of the cart, v, must decrease (because the relationship $mv=const.$ is an inverse relationship, so if m increases, v must decrease).

6 0

3 years ago

Canadian Olivia Oliver broke the Guinness World Record for the fastest spin on ice skates on January 2015 with an angular veloci

Shalnov [3]

Answer:

a) 2.63 : 1

b) 143.13 rpm

Explanation:

initial angular velocity ω' = 130 rpm

final angular velocity ω = 342 rpm

recall that angular momentum = ωI

where I is the moment of inertia.

for the initial spinning condition, we take moment of inertial = I'

for final spinning condition, we take moment of inertia = I

initial angular momentum = ω'I' = 130 I'

final angular momentum = ωI = 342 I

according to conservation of angular momentum, initial angular momentum must be equal to the final angular momentum, therefore

342 I = 130 I'

ratio of initial moment of inertia to final moment of inertia = I'/I

==> I'/I = 342/130 ≅ 2.63 : 1

b) to achieve a final angular velocity of of 375 rpm, her initial velocity will have to be

2.63 = 375/ω'

ω' = 375/2.63 = 143.13 rpm

6 0

3 years ago

If you could travel to a star 25 light-years away and return to earth at nearly the speed of light, how much time would elapse o

anastassius [24]

Millions and millions of years

7 0

4 years ago

Read 2 more answers