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4 years ago

When an electron jumps from an orbit where n = 4 to one where n=2, photon is absorbed. O True O False

Physics

1 answer:

Crank4 years ago

7 0

Answer:

False

Explanation:

This statement is negates the photoelectric effect.

When an electron absorbs energy it jumps from a lower shell to a higher shell. When the electron releases energy it jumps from a higher shell to a lower shell.

The Kinetic energy of an ejected electron is

$K_{max}=hf-\varphi$

Where,

h = Planck's Constant

f = Frequency of incident photon

$\varphi$ = Work function

So, this statement is false.

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Why are velocity and acceleration called vector quantities?

Airida [17]

Answer:because they both have magnitude and direction. Which can be identified from their SI Units.

Explanation:

because they both have magnitude and direction. Which can be identified from their SI Units.

4 0

3 years ago

Read 2 more answers

(1) Develop an equation that relates the rms voltage of a sine wave to its peak-to-peak voltage. a. If a sine wave has a peak-to

Aleks04 [339]

Answer:

(A) Equation will be $v=v_msin\omega t=0.75sin(18840t)$

(B) RMS value of voltage will be 0.530 volt

Explanation:

We have given peak to peak voltage of ac wave = 1.5 volt

Peak to peak voltage of ac wave is equal to 2 times of peak voltage

So $2v_{peak}=1.5volt$

$v_{peak}=\frac{1.5}{2}=0.75volt$

Frequency of ac wave is given f = 3 kHz

So angular frequency $\omega =2\pi f$ = 2×3.14×3000 = 18840 rad/sec

So expression of equation will be $v=v_msin\omega t=0.75sin(18840t)$ ( As phase difference is 0 )

Now we have to find the rms value of voltage

So rms voltage will be equal to $v_{rms}=\frac{v_{peak}}{\sqrt{2}}=\frac{0.75}{1.414}=0.530volt$

4 0

3 years ago

The response of an object to the force of gravity is called

Nadusha1986 [10]

Reaction force/support force/ lift/ buoyancy/ weight depends on situation

5 0

3 years ago

A parallel-plate capacitor has square plates that are 9.00 cmcm on each side and 4.10 mmmm apart. The space between the plates i

Mars2501 [29]

Answer:

U= 1.9*10^-7

Explanation:

given:

L=8 cm

d_1=d_2=2.05_10^-3

K_py=4.3

K_po=3

V_ab=86 V

required

U=??

solution:

the energy stored in the capacitor

U=1/2C_t*V^2_ab (1)

voltage is known but capacitance is not

we can consider the two plates of polystyrene and pyrex glass as a two separate capacitors connected on series so the total capacitance of series capacitor is given by:

1/C_t= 1/C_py+1/C_po (2)

the capacitance of polystyrene

C_po=K_po*A/d

=8.9*10^-11

= 89 pF

the capacitance of pyrex

C_py=K_py*A/d

=128 pF

substitution in 2 yields

1/C_t= 1/128+1/89

C_t= 52.6 pF

substitution in 1 yields

U=1/2C_t*V^2_ab

= 1.9*10^-7

7 0

3 years ago

Read 2 more answers

All forces on the bullets cancel so that the net force on a bullet is zero, which means the bullet has zero acceleration and is

andre [41]

The acceleration is defined as the rate of change of velocity.
So, if the acceleration is zero, this means that the rate of change of velocity is zero, which also means that the body is moving with constant velocity.
Since we are given that the net forces acting on the body is zero, this means that the body is at equilibrium

Based on this:
All forces on the bullets cancel so that the net force on a bullet is zero, which means the bullet has zero acceleration and is in a state known as equilibrium.

Note that if this constant velocity is equal to zero, then the body would be at rest (not moving)

7 0

3 years ago