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3 years ago

Explain the two types of interference that can happen when two sound waves meet

Physics

1 answer:

stepladder [879]3 years ago

5 0

==> Their sum is a wave with amplitude greater than either of

the original waves . . . Constructive interference

==> Their sum is a wave with amplitude less than either of

the original waves . . . Destructive interference

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If the average frequency emitted by a 160 W light bulb is 5.00 1014Hz and 10.0 of the input power is emitted as visible light ap

bearhunter [10]

Answer:

The value is $\frac{n}{t} = 4.83 *10^{19} \ photons / s$

Explanation:

From the question we are told that

The power rating of the bulb is $P = 160 \ W$

The frequency is $f = 5.00 *10^{14} \ Hz$

The percentage of the input power that is emitted as visible light is $\eta = 10\% = 0.10$

Generally the amount of power emitted as visible light is mathematically represented as

$P_l = 0.10 * P_i$

=> $P_l = 0.10 *160$

=> $P_l = 16 \ W$

Generally the amount of energy emitted as light is mathematically represented as

$E = n * h * f$

Here n is the number of photon , h is the Planks constant with value $h = 6.625*10^{-34} \ J\cdot s$

Generally this power emitted as visible light is mathematically represented as

$P_l = \frac{E}{t}$

=> $P_l = \frac{E}{t} = \frac{nhf}{t}$

=> $\frac{n}{t} = \frac{P_l }{hf}$

=> $\frac{n}{t} = \frac{16 }{6.625 *10^{-34}* (5.00*10^{14})}$

=> $\frac{n}{t} = 4.83 *10^{19} \ photons / s$

4 0

3 years ago

In which direction does a bag at rest move when a force of 20 newton's is applied from the right?

Olegator [25]

The bag moves to the left.

This is because of Newton's third law of motion that states:

For every action force on a body, there is an opposite and equal reaction force.

Thus pushing the bag from the right makes it move to the left.

8 0

4 years ago

Can someone help me?

vlabodo [156]

1. Science.
2. evidence

6 0

4 years ago

Read 2 more answers

The scientific method is? (apex)

Tcecarenko [31]

Answer:

C. The procedure scientist use to gain knowledge about the ohysical world

Explanation:

7 0

3 years ago

Read 2 more answers

AP Physics I, shouldn't be too hard.

Nana76 [90]

Answer:

The correct option is;

D. The kinetic energy decreases by 3·m₀·v₀²

Explanation:

The given parameters are;

The mass of object X = m₀

The initial velocity of object X = v₀

The mass of object Y = 2·m₀

The initial velocity of object Y = -2·v₀

By conservation of linear momentum, we have;

The total initial momentum = The total final momentum

Therefore, we have;

The total initial momentum = m₀·v₀ - 2·m₀·2·v₀ = The total final momentum

∴ The total final momentum = -3·m₀·v₀

The total mass of the two object after sticking together = 2·m₀ + m₀ = 3·m₀

Therefore, the velocity of the two objects after collision = (The total final momentum)/(Total mass) = -3·m₀·v₀/(3·m₀) = -v₀

The kinetic energy = 1/2 × Mass × (Velocity)²

Therefore, the kinetic energy after collision = 1/2 × (3·m₀) × v₀² = 3·m₀·v₀²/2

The kinetic energy before collision = 1/2 × m₀ × v₀² + 1/2 × (2·m₀) × (2·v₀)² = (1/2 + 4) × (m₀·v₀²)

∴ The kinetic energy before collision = 9·(m₀·v₀²)/2

The change in kinetic energy = The kinetic energy after collision - The kinetic energy before collision = 3·m₀·v₀²/2 - 9·(m₀·v₀²)/2 = -3·m₀·v₀²

Therefore, the kinetic energy decreases by 3·m₀·v₀².

5 0

3 years ago