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3 years ago

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What is the approximate wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes thr

ough a diffraction grating that has 250.0 lines per mm? 26 nm 32 nm 414 nm 518 nm

2 answers:

anzhelika [568]3 years ago

7 0

414nm just took the test

devlian [24]3 years ago

4 0

414 is the right answer. I just took the test and got an 100%

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A block attached to a spring with unknown spring constant oscilates with a period of 4.2 s. Parts A to D are independent questio

Solnce55 [7]

Answer:

Explanation:

A )

Th expression for time period for a spring -mass system is as follows

T = 2π $\sqrt{\frac{m}{k} }$

So if mass is doubled , Time period will be √2 or 1.414 times or 5.9 s

B )

If the mass is halved , time period becomes 1 / √2 times or .70 times or 3.0 s

C)

Time period does not depend upon the amplitude of oscillation . So in this case time period will be unchanged ie 4.2 s

D )

As per the formula above , if spring constant k is doubled , time period will be 1 / √2 times or .70 times or 3.0 s

8 0

3 years ago

Read 2 more answers

Certain meteorites have been examined and found to carry samples of which molecules?

ki77a [65]

Answer:

Sugars...

Explanation:

Several meteorites have been found to carry molecules of sugars that are essential for life. These sugars include Ribose, Arabinose and Xylose. These are found in meteorites that are rich in carbon. These significant discoveries can pave way in finding the origin of life on Earth.

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3 years ago

2. A student drives 7.8-km trip to school and averages a speed of

Alekssandra [29.7K]

Answer:

<em>The total time is: t=451.22 sec</em>

<em>The average speed is: V=34.57 m/s</em>

Explanation:

<u>Average speed</u>

The average speed is calculated by dividing the total distance traveled by an object (x) by the total time it took it to travel that distance (t).

$\displaystyle V=\frac{x}{t}$

Since the student makes the trip in two parts, we have to calculate the total distance and the total time.

We know the distance to school is 7.8 Km = 7,800 m. The student makes his way home over the same distance, thus the total distance is

x=2*7,800 m=15,600 m

The first trip to school was done at an average speed of v1=32.6 m/s. Knowing the distance and speed, we can calculate the time:

$\displaystyle t1=\frac{x1}{v1}=\frac{7,800}{32.6}=239.26\ sec$

The second trip back home was done at an average speed of v2=36.8 m/s. Let's calculate the second time:

$\displaystyle t2=\frac{x2}{v2}=\frac{7,800}{36.8}=211.96\ sec$

The total time is:

$t=239.26\ sec+211.96\ sec=451.22\ sec$

$\boxed{t=451.22\ sec}$

The average speed is:

$\displaystyle V=\frac{15,600}{451.22}=34.57\ m/s$

$\boxed{\displaystyle V=34.57\ m/s}$

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3 years ago

What does an object in equilibrium has a net force of .

Vlad1618 [11]

From our studies of the work of Professor Newton,
we have learned that

F = M a .

That is, the product of an object's mass and its acceleration
is equal to the net force acting on it.

An object in equilibrium is an object that has no acceleration.
In other words, it may be moving in a straight line at a speed
that does not change, or it may be just lying there before us.

In either case, since the object has no acceleration, we glance
at Newton's formula, and we instantly realize that the net force
on the object must be ZERO.

The object behaves just as if there were NO forces acting on it at all.

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4 years ago

What are 3 types of cells that helper T cells produce upon being an alarmed of an antigen? Thanks for your help!! :)

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Whenever these are an alarming due to a foreign antigen, the Helper T cells, Memory T cells, and Cytotoxic T cells are being produced. Helper T cells to recognize the specific foreign antigen that is entering the body, Memory T cells to remember the specific foreign antigen that is attacking, and Cytotoxic T cells that are for the destruction of the foreign cells and produce cytokines to attract macrophages

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3 years ago