What do all the materials that interact with the magnets have in common?

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.

sukhopar [10]

Answer:

A) As the source approaches you, the waves are compressed so that the pitch of the noise increases.

Explanation:

The Doppler Effect occurs when there is relative motion between an observer and the source of a wave. When this happens, there is an apparent shift in the frequency of the wave, as perceived by the observer. In particular, two situations can occur:

1- If the source of the wave is moving towards the observer, the waves are compressed, so that the wavelength of the wave decreases, and therefore the frequency (and so the pitch) increases

2- If the source of the wave is moving away from the observer, the waves are stretched, so that the wavelength of the wave increases, and therefore the frequency (and so the pitch) decreases

An example of Doppler Effect occurs when we hear the sound of the siren of an ambulance.

In this problem, the situation described is situation 1 (sound waves is approaching the observer), so according to the explanation above, the correct answer is

A) As the source approaches you, the waves are compressed so that the pitch of the noise increases.

3 0

4 years ago

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When illuminated with monochromatic light, a double slit produces a pattern that is a combination of single-slit diffraction and

d1i1m1o1n [39]

Answer:

The ratio is $k:d = 1 : 5$

Explanation:

From the question we are told that

The first minimum of the single slit pattern falls on the fifth maximum of the double slit pattern.

Generally the condition for constructive interference for as single slit is

$ksin(\theta) = n\lambda$

Here k is the width of the slit and n is the order of the fringe and for single slit n = 1 (cause we are considering the first maxima)

Generally the condition for constructive interference for as double slit is

$dsin\theta = m\lambda$

Here d is the separation between the slit and m is the order of the fringe and for double slit m = 5 (cause we are considering the first maxima)

=> $dsin\theta = 5\lambda$

So

$\frac{ksin(\theta)}{dsin(\theta)} = \frac{\lambda}{5\lambda}$

=> $\frac{k }{d} = \frac{1}{5}$

So

$k:d = 1 : 5$

5 0

3 years ago

A battery can be modeled as a source of emf in series, with both a resistance of 10Ωand an inductive reactance of 5

Fiesta28 [93]

Answer:

Explanation:

For circuit in resonance , inductive and capacitive reactance should be equal. Since in the given circuit , these two are not equal, the circuit is not in resonance. It does not depend upon voltage provided.

option b is correct.

With this load, the fraction of the average power, put out by the source of emf, delivered to the load can be calculated as follows

Power delivered to resistor will be 2/3 rd of total power delivered by source because resistance has value twice that of reactance of capacitor. So the correct option is .7

option D ) is correct.

3 0

4 years ago

In the formula used to solve problems related to the first law of thermodynamics, what does Q represent? A.internal energy

Blizzard [7]

B, heat, is the correct answer. Heat is represented by a capital q in thermodynamic equations.

7 0

3 years ago

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If a quantity of heat equal to the magnitude of the change in mechanical energy of the water goes into the water, what is its in

Flauer [41]

Increase in temperature of water = 0.53 °C
Explanation:
Change in mechanical energy = Potential energy
Potential energy = mgh
Mass, m = Mass of 1 L water = 1 kg
Acceleration due to gravity, g = 9.81 m/s²
Height, h = 225 m
Potential energy = 1 x 9.81 x 225 = 2207.25 J
Because of this 2207.25 J water gets heated.
Heat energy, E = mcΔT
Mass, m = Mass of 1 L water = 1 kg
Specific heat of water, c = 4200 J/kg/C
Energy, E = 2207.25 J
Change in temperature, ΔT = ?
Substituting
2207.25 = 1 x 4200 x ΔT
ΔT = 0.53 °C
Increase in temperature of water = 0.53 °C

3 0

3 years ago