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2 years ago

Scientific notation. jst 11a

Physics

1 answer:

coldgirl [10]2 years ago

5 0

Answer:

2 * 10^4

Explanation:

(3 * 10^4)(4 * 10^4) / (6 * 10^4)

= (12 * 10^8)/(6 * 10^4)

= 2 * 10^4

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Light of wavelength 650 nm is normally incident on the rear of a grating. The first bright fringe (other than the central one) i

garik1379 [7]

Answer

given,

wavelength (λ) = 650 nm

angle = 5°

using bragg's law

$sin \theta = \dfrac{n \lambda}{d}$

$d= \dfrac{n \lambda}{sin \theta}$

$d= \dfrac{1 \times 650 \times 10^{-9}\ m}{sin5^0}$

d = 7.46 x 10⁻⁴ cm

number of slits per centimeter

= $\dfrac{1}{d}\\\Rightarrow \dfrac{1}{7.46\times 10^{-4}}\\\Rightarrow 1340 split per centimeter.$

b) wavelength of two rays 650 nm and 420 nm

$d = \dfrac{1}{5000}$

d = 2 x 10⁻6 m

we now,

$sin \theta = \dfrac{n \lambda}{d}$

for 650 nm

$sin \theta = \dfrac{2\times 650\times 10^{-9}}{2\times 10^{-6}}$

$\theta =sin^{-1}(0.65)$

θ = 40.54°

for 450 nm

$sin \theta = \dfrac{2\times 450\times 10^{-9}}{2\times 10^{-6}}$

$\theta =sin^{-1}(0.45)$

θ = 24.83°

now, difference

|θ_{650} -θ_{420}| =40.54°-24.83°

|θ_{650} -θ_{420}| =19.71°

8 0

4 years ago

A 1500kg car is at rest before it accelerates when the light turns green. If it covers 45.0 meters in 15.0 seconds, what is the

lana [24]

Answer:

300N

Explanation:

Given parameters:

Mass of car = 1500kg

Initial velocity = 0m/s

Distance covered = 45m

Time = 15s

Unknown:

Net force applied = ?

Solution:

From Newton's second law:

Force = mass x acceleration

Force = mass x $\frac{v - u}{t}$

v is the final velocity

u is the initial velocity

t is the time taken

Final velocity = $\frac{45}{15}$ =3m/s

Force = 1500 x $\frac{3 - 0}{15}$ = 300N

8 0

3 years ago

River water held behind a dam is a form of ________. group of answer choices

WINSTONCH [101]

Potential energy is present in the river water behind a dam.

<h3>How is potential energy defined?</h3>

Potential energy is a form of stored energy that is dependent on the relationship between different system components.
When a spring is compressed or stretched, its potential energy increases.
If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.
The object's mass, its mass in relation to some reference points, and the gravitational field it is in all affect the potential energy of the object.
Joule is the SI unit of potential energy as a result (J)
As weight and height increase, gravitational potential energy rises.

learn more about Potential energy here

brainly.com/question/13997830

#SPJ4

8 0

2 years ago

In addition to stand-alone discussion boards, all of these sites include discussion boards as part of their features except:

adell [148]

Answer:

A. Linkedln

Explanation:

In addition to stand-alone discussion boards, all of these sites include discussion boards as part of their features except:

A. Linkedln