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3 years ago

PLEASE HURRY!!!

Physics

1 answer:

Liula [17]3 years ago

7 0

Hi! it’s 24 hours, 14 minutes, 33 seconds.
i hope this is right

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Explain why each element has a unique spectrum of absorption or emission lines.

Naya [18.7K]

Each elements emission spectrum is distinct because each element has a different set of electron energy levels. The emission lines correspond to the differences between various pairs of the many energy levels. The lines (photons) are emitted as electrons fall from higher energy orbitals to lower energies.

6 0

3 years ago

A golfer hits a ball at an angle of 12 degrees above horizontal. The velocity of the ball is 37 m/s. What is the horizontal dist

ruslelena [56]

72 m is the horizontal distance the travels.

Option: C

Explanation:

The units to express the horizontal and vertical distances are meters (m). The "horizontal" and "vertical" velocities are expressed in "meters per second" (m/s).

Horizontal distance = (initial horizontal velocity)(time)

We can now get the range x from the horizontal component of velocity

$x=v_{x o} \times t$ equation (1)

$\mathrm{v}_{\mathrm{xo}}=\text { initial horizontal velocity }(\mathrm{m} / \mathrm{s})$

x = horizontal distance (m)

t = time (s)

$\mathrm{v}_{\mathrm{x} \mathrm{o}}=\mathrm{v} \cos \theta$

We know that, V = 37 m/s, θ = 12 degree and t = 2 seconds.

To find, $\mathrm{v}_{\mathrm{x} \mathrm{o}}=\mathrm{v} \cos \theta$

$\mathrm{V}_{\mathrm{x} \mathrm{o}}=37 \times \cos 12$

$\mathrm{V}_{\mathrm{x} \mathrm{o}}=37 \times 0.974$

$\mathrm{V}_{\mathrm{x} \mathrm{o}}=36.038$

$\mathrm{Now}, \mathrm{x}=\mathrm{v}_{\mathrm{xot}}$

$x=36.038 \times 2$

x = 72.076 m ~ 72 m

x = 72 m

The horizontal distance is 72 m.

5 0

4 years ago

When electrons are passed through a crystal, they form a pattern on the other side that is very similar to a wave-interference p

Katen [24]

Explanation:

We can conclude that De Broglie's hypothesis is true. In this hypothesis the concept of matter wave was introduced, establishing that electrons have wave-like properties. Thus, all matter exhibits properties of both particles and waves, that behave in one way or another depending on the specific experiment.

7 0

3 years ago

At a certain time a particle had a speed of 43 m/s in the positive x direction, and 5.8 s later its speed was 95 m/s in the oppo

Vanyuwa [196]

Answer:

$-23.8\frac{m}{s^{2}}$

Explanation:

Average acceleration is defined as the change on velocity on an interval of time:

$a_{avg}=\frac{V_f-V_i}{t}$

with Vf the final velocity, Vi the initial velocity and t the time interval. Note that the initial velocity is positive because is in the positive x direction and final velocity is negative because is in the opposite direction, so:

$a_{avg}=\frac{-95\frac{m}{s}-43\frac{m}{s}}{5.8s}$

$a_{avg}=-23.8\frac{m}{s^{2}}$

The negative sign indicates that the acceleration is in the negative x direction.

4 0

4 years ago

73Ge 32 has neutrons.

gayaneshka [121]

It has 41 neutrons because 73 is sum of neutron number and proton number and we know that its proton number is 32 so you can just write 73-32 and it is equal to 41 neutrons

5 0

4 years ago