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3 years ago

A sharp image is formed when light reflects from a

2 answers:

7 0

Answer: Regular reflection occurs when light reflects off a very smooth surface and forms a clear image. Diffuse reflection occurs when light reflects off a rough surface and forms a blurry image or no image at all.

Explanation:

Doss [256]3 years ago

3 0

Answer:

Regular reflection

Explanation:

Regular reflection occurs when light reflects off a very smooth surface and forms a clear image.

i hope this helps a bit.

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Which of the following is neutral?

Sauron [17]

Answer:

atoms and neutrons

Explanation:

electrons have a negative charge

protons have a positive charge

cations are positive ions

anions are negative ions

4 0

3 years ago

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What is the energy in joules and ev of a photon in a radio wave from an am station that has a 1500 khz broadcast frequency?

LekaFEV [45]

E=hf
E=6.626e-34[Js]•1500e3[Hz]=9.939e-28[J]
For eV divide this by electron charge
9.939e-28[J]/1.6022e-19[C/e]=
6.203e-9eV

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4 years ago

A hammer taps on the end of a 4.10-m-long metal bar at room temperature. A microphone at the other end of the bar picks up two p

xz_007 [3.2K]

Answer:

Speed of sound inside metal is ≅ 8200 $\frac{m}{s}$

Explanation:

Given :

Length of metal bar $x = 4.10$ m

From general velocity equation,

$v = \frac{x}{t}$

Where $v =$ speed of sound in air = 343 $\frac{m}{s}$

For finding time from above equation,

$t = \frac{x}{v}$

$t = \frac{4}{343}$

$t = 0.01166$ sec

Since pulses are separated by $t_{o} =$ $11.1 \times 10^{-3} = 0.0111$ sec

So we take time difference,

$\Delta t = t_{} -t_{o} = 0.0005$

So speed of sound in metal is,

$v = \frac{x}{\Delta t }$

$v = \frac{4.10}{0.0005}$

$v = 8200$ $\frac{m}{s}$

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3 years ago

1. Summarize What are the four conditions of a<br>purely competitive market?

bearhunter [10]

Answer:

Explanation:

1. Many buyers and sellers participate in the market.

2. Sellers offer identical products.

3. Buyers and sellers are well informed about products.

4. Sellers are able to enter and exit the market freely.

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3 years ago

A car travels at a steady speed of 10 m/s. What distance is covered in a minute?

AfilCa [17]

Answer:

600

Explanation:

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3 years ago

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