Why are ceiling of concert hall and conference halls made curved?

Answers

Answer 1

Answer:

The ceiling of a concert hall and conference halls are made curved so that the sound that emanates from the source will reflect to any point of the curve of these halls. Thereby, increasing the sound wave travelled across the hall.

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A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current of 12 A through the body at 25 V for a very short time, usually about 3.0 ms. (a) What power does the defibrillator deliver to the body, and (b) how much energy is transferred
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A current is always developed in the secondary of a transformer. true or false

What would happen if a person who is wearing a heavy winter jacket were to place a thermometer inside the jacket next to his or her skin? What would happen if we took the same jacket, after it had been hanging in a closet, and placed a thermometer inside?

Answers

Answer:

Explained.

Explanation:

Let me explain the two cases in by one.

(1) When Person wearing a jacket, heat from his or her body is going to get trapped inside his or her jacket to keep this person warm when a thermometer is placed inside, it would indicate a higher temperature on the scale.

(2) When Jacket is Hanging in a closet, its temperature would be roughly close to room temperature and when we would place a thermometer it would not indicate any change on its scale.

Radium-226 is unstable. What is the process that allows the nucleus of radium-226 to become more stable? Question 14 options: A. ionic bonding B. radioactive decay C. hydrogen bonding D. covalent bonding E. nuclear fusion

Answers

Answer: The correct answer is Option B.

Explanation:

We are given a radioisotope which is unstable in nature. For this isotope to become stable, it has to undergo radioactive decay. There are various processes by which a radioisotope may decay:

1. Alpha decay: In this decay process, a heavier nuclei decays into lighter nuclei. The particle released is alpha particle.

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

2) Gamma decay: In this decay process, an unstable nuclei gives excess energy by a process of spontaneous electromagnetic process. This decay process releases $\gamma -radiations$ .

$_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma$

3) Beta-plus decay: In this decay process, a neutron gats converted into a proton and an electron. The particle released is $\beta-particle$

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_0^(-1)\beta$

4) Beta-minus decay: In this decay process, a proton gets converted into a neutron and an electron neutrino which is known as a positron particle. This is also known as $\beta ^+$ -decay.

$_Z^A\textrm{X}\rightarrow _(Z-1)^A\textrm{Y}+_(+1)^0e$

Radium-226 nuclei undergoes alpha decay to form Radon-222 nuclei by releasing alpha-particle.

$_(88)^(226)\textrm{Ra}\rightarrow _(86)^(222)\textrm{Rn}+_2^4\alpha$

Hence, the answer is Option B.

the correct answer for this question is radio active decay or option b ! press brainliest...

A soccer ball is released from rest at the top of a grassy incline. After 4.1 seconds, the ball travels 43 meters and 1.0 s after this, the ball reaches the bottom of the incline. What was the magnitude of the ball's acceleration, assume it to be constant? Express your answer using two significant figures.

Answers

Answer:

The acceleration of the ball as it moves down the grassy incline, if constant, is 5.1 m/s²

Explanation:

Initial velocity, u = 0m/s

Acceleration = ?

Vertical distance covered as at t=4.1s, H = 43m

Using the equations of motion,

H = ut + 0.5at²

43 = 0 + 0.5a (4.1)²

a = 43/(0.5×4.1²) = 5.1 m/s²

Hope this Helps!!

An aiplane is traveling at 500 mph for 3.5 hours. how far did the plane travel

Answers

Answer:

1750mile

Explanation:

500/h

3.5h=3.5×500=1750

If the volume of a gas is 2.0 L and itspressure is 5 atm what will the new
reported volume if the pressure is
increased to 9.5 atm?

Answers

Answer:

The answer is 1.05 atm

Explanation:

The new volume can be found by using the formula for Boyle's law which is

$P_1V_1 = P_2V_2$

Since we are finding the new volume

$V_2 = (P_1V_1)/(P_2) \n$

From the question we have

$V_2 = (2 * 5)/(9.5) = (10)/(9.5) \n = 1.05263157...$

We have the final answer as

1.05 atm

Hope this helps you

What is its characteristic wavelength? [Hint: Recall that the kinetic energy of a moving object is E=12mv2, where m is the mass of the object and v is the speed of the object.]

Answers

Answer:

λ = $1.06 * 10^(-11) m$

Explanation:

Using the De Broglie equation, the characteristic wavelength is given by:

λ = $(h)/(p)$

where

h = Planck's constant = $6.626 * 10^(-34)$ Js.

p = momentum

Momentum, p, can be calculated using:

p = $√(2Em)$

where

m = mass of the electron = $9.11 * 10^(-31)$ kg

E = Energy of the electron = 13.4 keV = $13.4 * 10^3 * 1.6 * 10^(-19)$ J = $2.144 * 10^(-15)$ J

=> p = $\sqrt{2 * 2.144 * 10^(-15) * 9.11 * 10^(-31)}$

p = $\sqrt{3.906 * 10^(-45)}$

p = $6.250 * 10^(-23)$ kgm/s

Therefore, characteristic wavelength, λ, is:

λ = $(6.626 * 10^(-34))/(6.250 * 10^(-23))$

λ = $1.06 * 10^(-11) m$

In physics, the characteristic wavelength is the wavelength associated with an object's kinetic energy. It can be determined using the equations for energy, frequency, and wavelength.

In physics, the characteristic wavelength refers to the wavelength associated with a moving object's kinetic energy. The kinetic energy of an object is given by 1/2mv², where m is the mass of the object and v is its speed.

When an object's kinetic energy is known, we can use the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the wave associated with the object, to find the characteristic wavelength.

The equation is rearranged to solve for f, and then the frequency is used to calculate the wavelength using the formula λ = c/f, where λ is the wavelength and c is the speed of light.

By plugging in the given values of the object's mass and speed, you can determine its characteristic wavelength using these equations.

Learn more about characteristic wavelength here:

brainly.com/question/34267508

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