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2 years ago

1. The number of protons in an atom, unique to each element, is known as the ___________.

Physics

1 answer:

Gnoma [55]2 years ago

4 0

Answer:

atomic number

Explanation:

the number of protons in an atom is called its "atomic number"

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You are trying to find out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You disc

FrozenT [24]

Answer:

The balloon hit the ground with velocity -15.34 m/s

Explanation:

Lets explain how to solve the problem

You found that the best height to pitch a water balloon in order for it to

burst when it hits the ground is 12 meters.

We consider that the 12 meters is the maximum height, so the velocity

at this height is zero.

To find the velocity when the balloon hits the ground lets use the rule

v² = u² + 2gh, where v is the final velocity, u is the initial velocity, g is

the acceleration of gravity and h is the height.

u = 0 , h = 12 m , g = 9.8 m/s²

Substitute these values in the equation above

v² = 0 + 2(9.8)(12)

v² = 235.2

Take square root for both sides

v = ± $\sqrt{235.2}$

The velocity is downward, then it's a negative value

Then v = -15.34 m/s

The balloon hit the ground with velocity -15.34 m/s

6 0

2 years ago

"In a Young’s double-slit experiment, the separation between slits is d and the screen is a distance D from the slits. D is much

san4es73 [151]

Answer:

The number of bright fringes per unit width on the screen is, $x=\dfrac{\lambda D}{d}$

Explanation:

If d is the separation between slits, D is the distance between the slit and the screen and $\lambda$ is the wavelength of the light. Let x is the number of bright fringes per unit width on the screen is given by :

$x=\dfrac{n\lambda D}{d}$

$\lambda$ is the wavelength

n is the order

If n = 1,

$x=\dfrac{\lambda D}{d}$

So, the the number of bright fringes per unit width on the screen is $\dfrac{\lambda D}{d}$ . Hence, the correct option is (B).

6 0

2 years ago

What is a oxidation number

Scilla [17]

Oxidation number is the charge.

6 0

2 years ago

Read 2 more answers

Which orbit has the highest energy? n = 1 n = 2 n = 3

PIT_PIT [208]

Answer:

Explanation:

The closer an orbit is to the nucleus the fewer energy

4 0

2 years ago

A concert loudspeaker suspended high off the ground emits 31 W of sound power. A small microphone with a 1.0 cm^2 area is 42 m f

Aleonysh [2.5K]

Answer:

intensity of sound at level of microphone is 0.00139 W / m 2

sound intensity level at position of micro phone is 91.456 dB

EXPLANATION:

Given data:

power of sound P = 31 W

distance betwen microphone & speaker is 42 m

a) intensity of sound at microphone is calculated as

$I = \frac{P}{A}$

$= \frac{34}{4 \pi ( 44m )^ 2}$

= 0.00139 W / m 2

b) sound intensity level at position of micro phone is

$\beta = 10 log \frac{I}{I_o}$

where I_o id reference sound intensity and taken as

$= 1 * 10^{-12} W / m 2$

$\beta = 10 log\frac{0.00139}{10^[-12}}$

= 91.456 dB

7 0

2 years ago