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AfilCa [17]
3 years ago
9

if researchers hit a sheet of metal with a yellow light and nothing happens, what color should the try next?​

Physics
1 answer:
Nataliya [291]3 years ago
3 0

The photoelectric emission is possible if the wavelength of the incident light is less than that of yellow light

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To provide some perspective on the dimensions of atomic defects, consider a metal specimen that has a dislocation density of 105
-Dominant- [34]

Explanation:

LD₁ = 10⁵ mm⁻²

LD₂ = 10⁴mm⁻²

V = 1000 mm³

Distance = (LD)(V)

Distance₁ = (10⁵mm⁻²)(1000mm³) = 10×10⁷mm = 10×10⁴m

Distance₂ = (10⁹mm⁻²)(1000mm³) = 1×10¹² mm = 1×10⁹ m

Conversion to miles:

Distance₁ = 10×10⁴ m / 1609m = 62 miles

Distance₂ = 10×10⁹m / 1609 m = 621,504 miles.

7 0
3 years ago
Read 2 more answers
25% part (c) assume that d is the distance the cheetah is away from the gazelle when it reaches full speed. Derive an expression
levacccp [35]

maximum speed of cheetah is

v_1 = v_{max}

speed of gazelle is given as

v_2 = v_{g}

Now the relative speed of Cheetah with respect to Gazelle

v_{12} = v_1 - v_2

v_{12} = v_{max} - v_g

now the relative distance between Cheetah and Gazelle is given initially as "d"

now the time taken by Cheetah to catch the Gazelle is given as

d = v_{12}* t

so by rearranging the terms we can say

t = \frac{d}{v_{12}}

t = \frac{d}{v_{max} - v_g}

so above is the relation between all given variable

6 0
3 years ago
How are magnetic poles and electrical charges similar? A. Their same forces repel each other, and their opposite forces attract
melomori [17]

Answer:

A. Their same forces repel each other, and their opposite forces attract each other.

Explanation:

As we know by the property of electric charge that similar charges repel each other and opposite charges attracts each other

So here we have similar situation in magnets also

Two similar poles or like poles of magnet i.e. North - North poles or South - South poles always repel each other

And also we can see that opposite poles of magnet each other i.e. North pole and south pole always attract each other.

SO here correct answer is

A. Their same forces repel each other, and their opposite forces attract each other.

8 0
3 years ago
Convert the following dB to decimal a. -12 b. 3 c. 10 d. 0
stiks02 [169]

Answer:

for -12db

 \frac{V1}{V2}=0.251\\\\\frac{P1}{P2}=0.0631

for 3db

\frac{V1}{V2}=\sqrt{2}\\\\\frac{P1}{P2}=2

for 10db

\frac{V1}{V2}=3.16\\\\\frac{P1}{P2}=10

for 0db

\frac{V1}{V2}=1\\\\\frac{P1}{P2}=1

Explanation:

The decibel is a logaritmic value given by:

db=10*log(\frac{P1}{P2})=20*log(\frac{V1}{V2})

we use 10 for power values and 20 for other values such voltages or currents.

\frac{V1}{V2}=10^{\frac{db}{10}}\\\\\frac{P1}{P2}=10^{\frac{db}{20}}

for -12db

\frac{V1}{V2}=10^{\frac{-12}{10}}=0.251\\\\\frac{P1}{P2}=10^{\frac{-12}{20}}=0.0631

for 3db

\frac{V1}{V2}=10^{\frac{3}{10}}=\sqrt{2}\\\\\frac{P1}{P2}=10^{\frac{3}{20}}=2

for 10db

\frac{V1}{V2}=10^{\frac{10}{10}}=3.16\\\\\frac{P1}{P2}=10^{\frac{10}{20}}=10

for 0db

\frac{V1}{V2}=1\\\\\frac{P1}{P2}=1

4 0
3 years ago
A forecaster may say that he or she looks for "right-moving" thunderstorms when predicting severe weather. the "right-moving" th
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Here is the answer to the given question above. <span>The majority of supercell thunderstorms move to the right of the mean layer wind. This tendency is the result of differences in barometric pressure that develop as vertical wind shear interacts with the storm's updraft. In response to this vertical wind shear, an area of low pressure develops in the upper region of the down shear (right) side of the storm's updraft. In contrast, a region of relatively higher pressure forms on the other side of the updraft in the up shear portion of the storm. The region of low pressure on the right side of the updraft creates a favorable environment for propagation of the storm and, in response, it moves to the right.</span>
3 0
3 years ago
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