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hoa [83]
3 years ago
9

By what factor does the energy of a 1-nm X-ray photon exceed that of a 10-MHz radio photon? How many times more energy has a 1-n

m gamma ray than a 10-MHz radio photon?
Physics
1 answer:
DiKsa [7]3 years ago
3 0

To solve this problem we will apply the concepts related to the relationship between energy and frequency, from the latter we will obtain similar expressions that relate to the wavelength to find the two energy states between the given values. Finally we will make the comparative radius between the two. The relation between energy and frequency is given as,

E = hf

Here,

E = Energy

h = Planck's constant

The relation between the speed of the electromagnetic waves (c), frequency (f) and wavelength (\lambda ) is,

c = f\lambda

Rearrange the above equation for frequency f as follows

f = \frac{c}{\lambda}

Substitute,

E = h\frac{c}{\lambda}

The wavelength x-ray or gamma ray photon is

\lambda = 1.0nm (\frac{1nm}{10^{9}nm})

\lambda = 10^{-9} m

Therefore the energy would be,

E_1 = \frac{hc}{\lambda}

E_1 = \frac{(6.63*!0^{-34}J\cdo s)(3*10^{8}m/s)}{10^{-9}m}

E_1 = 19.89*10^{-17} J

The frequency is given as,

f = 10MHz (\frac{10^6z}{1.0MHz})

f = 10^7Hz

Now the second energy would be

E_2 = hf

E_2 = (6.63*10^{-27}J\cdot s)(10^7Hz)

E_2 = 6.63*10^{-27}J

Therefore the ratio between them is

\frac{E_1}{E_2} = \frac{19.89*10^{-17}J}{6.63*10^{-27}J}

\frac{E_1}{E_2} = 3*10^{20}

Therefore the energy of 1nm x ray or gamma ray photon is 3*10^{20} times more than energy of 10MHz radio photon

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A 1.40 mH inductor and a 1.00 µF capacitor are connected in series. The current in the circuit is described by I = 14.0 t, where
4vir4ik [10]

Answer:

Explanation:

Inductance L = 1.4 x 10⁻³ H

Capacitance C = 1 x 10⁻⁶ F

a )

current I = 14 .0 t

dI / dt  = 14

voltage across inductor

= L dI / dt

= 1.4 x 10⁻³ x 14

= 19.6 x 10⁻³ V

= 19.6 mV

It does not depend upon time because it is constant at 19.6 mV.

b )

Voltage across capacitor

V = ∫ dq / C

= 1 / C ∫ I dt  

= 1 / C ∫ 14 t dt

1 / C x 14 t² / 2

= 7 t² / C

= 7 t² / 1 x 10⁻⁶

c ) Let after time t energy stored in capacitor becomes equal the energy stored in capacitance

energy stored in inductor

= 1/2 L I²

energy stored in capacitor

= 1/2 CV²

After time t

1/2 L I² = 1/2 CV²

L I² =  CV²

L x ( 14 t )² = C x  ( 7 t² / C )²

L x 196 t² = 49 t⁴ / C

t² = CL x 196 / 49

t = 74.8 μ s

After 74.8 μ s energy stored in capacitor exceeds that of inductor.

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Which of the following mathematical operations are and are not not allowed on two quantities with different unit dimensions?
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The following mathematical operations are and are not allowed on two quantities with different unit dimensions are C) Allowed : Multiplication, Division , Not Allowed : Addition, Subtraction, Equality

To answer the question, we have to know what mathematical operations are.

<h3>What are Mathematical operations?</h3>

Mathematical operations are operations which are performed to change the value of a variable. The arithmetic mathematical operations we have are

  • addition,
  • subtraction,
  • multiplication,
  • subtraction and
  • equality which shows the relationship between two quantities.

Now, for two quantities with different unit dimensions, addition, subtraction and equality are not allowed because these mathematical operations require the quantities to be in the same unit dimensions

Also, for two different quantities with differnt unit dimensions, multiplication and division are allowed because these mathematical operations do not require the quantities to be in the same unit dimensions.

So, the mathematical operations that are allowed are multiplication and division while the mathematical operations that are not allowed are addition, subtraction and equality.

So, the following mathematical operations are and are not allowed on two quantities with different unit dimensions are C) Allowed : Multiplication, Division , Not Allowed : Addition, Subtraction, Equality

Learn more about mathematical operations here:

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2 years ago
How fast did Newton decide a cannon ball shot out in order to escape Earth’s gravity?
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Plugging in for the Earth's mass and for G, we have 11.2 km/s for the escape velocity for an object launched from the Earth's surface. This is about 25,000 miles per hour

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