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3 years ago

Wind erosion can be reduced by _____.

1 answer:

4 0

Using land according to its capability. protect the soil surface with some form of cover. control runoff before it develops into an erosive force

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Suppose a light source is emitting red light at a wavelength of 700 nm and another light source is emitting ultraviolet light at

klasskru [66]

Answer:

b) twice the energy of each photon of the red light.

Explanation:

$\lambda$ = Wavelength

h = Planck's constant = $6.626\times 10^{-34}\ m^2kg/s$

c = Speed of light = $3\times 10^8\ m/s$

Energy of a photon is given by

$E=h\nu\\\Rightarrow E=h\dfrac{c}{\lambda}$

Let $\lambda_1$ = 700 nm

$\lambda_2=350\\\Rightarrow \lambda_2=\dfrac{\lambda_1}{2}$

For red light

$E_1=\dfrac{hc}{\lambda_1}$

For UV light

$E_2=\dfrac{hc}{\dfrac{\lambda_1}{2}}$

Dividing the equations

$\dfrac{E_1}{E_2}=\dfrac{\dfrac{hc}{\lambda_1}}{\dfrac{hc}{\dfrac{\lambda_1}{2}}}\\\Rightarrow \dfrac{E_1}{E_2}=\dfrac{1}{2}\\\Rightarrow E_2=2E_1$

Hence, the answer is b) twice the energy of each photon of the red light.

7 0

3 years ago

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Q¹=0,07Mc Q²=2C r=1,08 cm F=.......?

Nostrana [21]

The force (F) of attraction or repulsion between two point charges (Q1 and Q2) is given by the following rule:
F = (k * q1 * q2) / (r^2) where:
q1 and q2 are the charges
k is coulomb's constant = 9 x 10^9 N. m2/ C2
r is the distance between the two charges.

Applying the givens in the mentioned equation, we find that:
F = (9 x 10^9 x 0.07 x 10^6 x 2) / (0.0108)^2 = 1.08 x 10^19 n

5 0

3 years ago

how does gravity affect objects of different mass close to earth, and how does that effect change as an object moves farther fro

Luda [366]

Answer:

It makes it lighter when its closer and heavier when its farther way.

Explanation:

3 0

2 years ago

Learning Goal: To understand the nature of a sound wave, including its properties: frequency, wavelength, loudness, pitch, and t

Lady_Fox [76]

Answer:

Sound wave is a longitudinal wave that propagates in a medium

Explanation:

Part A: (C) Sound wave is propagation of pressure fluctuations in a medium.

Part B: (C) Pressure fluctuations travel along the direction of propagation of the sound wave.

Part C: (A) Yes air play a role in the propagation of the human voice from one end of the lecture hall to the other.

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3 years ago

2. State Newton's third law of motion.

Grace [21]

Answer:

Action and reaction are equal but act in opposite directions

4 0

3 years ago

Read 2 more answers