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3 years ago

True or false? All waves need a medium in order to travel

2 answers:

4 0

That's false. Mechanical waves (like sound and ocean waves) do
need a medium to travel in, but electromagnetic waves (like radio
and light) don't.

Pavlova-9 [17]3 years ago

3 0

That is false because electromagnetic waves can travel without a medium.

hope this helps :)

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What is the name of the process where an object is exposed to nuclear radiation

Murljashka [212]

Answer:

Exposing objects to beams of radiation is called irradiation

6 0

2 years ago

Roman55 [17]

Inertia is directly related to Mass .

<u>Explanation</u>:

Mass means that the amount of matter of an object. Inertia indicates the resistance of the physical object. The object with high mass have more inertia too. The mass and inertia both are directly proportional to each other. Mass is the quantity that completely depends upon the inertia of the object. An object with more mass has more chance to change its resistance as they are dependent on each other.

7 0

3 years ago

A photoelectric experiment is performed where green light with a wavelength of 546.1 nm is shined on a metal plate, creating a p

PtichkaEL [24]

Answer:

$\phi=1.55 [eV]$

Explanation:

We can use the work function equation for a photoelectric experiment:

$\phi=\frac{hc}{\lambda}-K_{max}$

h is the plank constant
c is the speed of light
λ is the wave length
K is the kinetic energy (or K=eΔV)

So we will have:

$\phi=\frac{hc}{\lambda}-e\Delta V$

$\phi=\frac{6.63*10^{-34}*3*10^{8}}{546.1*10^{-9}}-0.728eV$

$\phi=3.64*10^{-19}[J]-0.728 [eV]$

$\phi=(3.64*10^{-19}[J]*\frac{1eV}{1.6*10^{-19}[J]})-0.728 [eV]$

$\phi=2.28 [eV] - 0.728 [eV]$

$\phi=1.55 [eV]$

I hope it helps you!

8 0

4 years ago

Read 2 more answers

What expression gives the amount of light energy (in J per photon) that is converted to other forms between the fluorescence exc

erastovalidia [21]

Answer:

E = hf or $E=\dfrac{hc}{\lambda}$

Explanation:

The expression that gives the amount of light energy that is converted to other forms between the fluorescence excitation and emission events is given by :

E = hf

f is the frequency

$E=\dfrac{hc}{\lambda}$

c is the speed of light

$\lambda$ is the wavelength

Hence, this is the required solution.

8 0

3 years ago

A 25.2 kg gazelle moving 2.33 m/s

docker41 [41]

Force = mass x acceleration
113N = 25.2a
a = 4.48 m/s^2
Vf = Vi + at
Vf = 2.33 + 4.48(2) = 11.3 m/s

6 0

3 years ago