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3 years ago

Lightning can sometimes occur on hot and humid summer evenings when there are no thunderstorms.

Physics

2 answers:

N76 [4]3 years ago

8 0

B False because facts

mart [117]3 years ago

4 0

Answer:

(B) False

Explanation:

No, it is not possible to have thunder without lightning. Thunder is a direct result of lightning.

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Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with

anastassius [24]

Answer:

2.11 m

Explanation:

Given data

h=6.626× $10^{-34\\}$ (plank constant)

L=45.7 pm

n=n2-n1

n=5-1

n=4

where,

n2=5

n1=1

To find:

E=?

λ=? (Wavelength)

solution

The energy stored in an electron at a specified level is given by;

E= $h^{2}$ × $n^{2}$ ÷8m $l^{2}$ ..........(1)

m=mass of electron(9.1× $10^{-31}$ )

l=length of box

To find E

putting the value of given data in eq(1)

E=9.41× $10^{-16}$

To find λ

λ=hc/E............................(2)

c=3× $10^{8}$ (speed of light)

putting the value in eq 2 to find wavelength

λ=2.11 m

Note:

There is a chance in calculation error. but the method is correct to solve the problem.

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3 years ago

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The blades in a blender rotate at a rate of 6800 rpm . When the motor is turned off during operation, the blades slow to rest in

tangare [24]

The angular acceleration of the blade when it's switched off is (-6800 rev/min) divided by (2.8 sec) = -2,428.6 rev/(min-sec) = -40.5 rev/sec^2 .

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3 years ago

What is the magnitude of the electric force of attraction between two point charges + 2.8 mc and -1.2 mc if the distance

Anit [1.1K]

Answer:

Explanation:

it just a

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3 years ago

Hello help me pls! i need serious help

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Answer:c

Explanation:

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2 years ago

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Consider a bicycle wheel to be a ring of radius 30 cm and mass 1.5 kg. Neglect the mass of the axle and sprocket. If a force of

vredina [299]

Answer:

The angular speed after 6s is $\omega = 1466.67s^{-1}$ .

Explanation:

The equation

$I\alpha = Fd$

relates the moment of inertia $I$ of a rigid body, and its angular acceleration $\alpha$ , with the force applied $F$ at a distance $d$ from the axis of rotation.

In our case, the force applied is $F = 22N$ , at a distance $d = 6cm =0.06m$ , to a ring with the moment of inertia of $I =mr^2$ ; therefore, the angular acceleration is