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4 years ago

Indicate whether the statement is true or false. If false, change the identified word or phrase to make me su

Physics

2 answers:

Alja [10]4 years ago

8 0

It’s true
Took the test before

Elza [17]4 years ago

5 0

V = wf
ex) 5m • 16 Hz = 80 m/s
5m • 20 Hz = 100 m/s
Answer : True because when multiplying the same wavelength with an increase in frequency, will give you a higher velocity (speed).

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How many photons will be required to raise the temperature of 1.8 g of water by 2.5 k ?'?

tatyana61 [14]

Missing part in the text of the problem:
"<span>Water is exposed to infrared radiation of wavelength 3.0×10^−6 m"</span>

First we can calculate the amount of energy needed to raise the temperature of the water, which is given by
$Q=m C_s \Delta T$
where
m=1.8 g is the mass of the water
$C_s = 4.18 J/(g K)$ is the specific heat capacity of the water
$\Delta T=2.5 K$ is the increase in temperature.

Substituting the data, we find
$Q=(1.8 g)(4.18 J/(gK))(2.5 K)=18.8 J=E$

We know that each photon carries an energy of
$E_1 = hf$
where h is the Planck constant and f the frequency of the photon. Using the wavelength, we can find the photon frequency:
$\lambda = \frac{c}{f}= \frac{3 \cdot 10^8 m/s}{3 \cdot 10^{-6} m}=1 \cdot 10^{14}Hz$

So, the energy of a single photon of this frequency is
$E_1 = hf =(6.6 \cdot 10^{-34} J)(1 \cdot 10^{14} Hz)=6.6 \cdot 10^{-20} J$

and the number of photons needed is the total energy needed divided by the energy of a single photon:
$N= \frac{E}{E_1}= \frac{18.8 J}{6.6 \cdot 10^{-20} J} =2.84 \cdot 10^{20} photons$

4 0

3 years ago

200 J of work is done when a force is applied to an object and the object moves 10 m to the right. How much Force was applied?

ArbitrLikvidat [17]

Answer:

20N

Explanation:

Given parameters:

Work done = 200J

Distance moved = 10m

Unknown:

Amount of force applied =?

Solution:

Work done is the force applied on a body to move it in the direction of the force.

Work done = force x distance

The unit of work done is in joules

Since the unknown is force, we make it the subject of the expression;

Force = $\frac{Work done}{distance}$

Force = $\frac{200}{10}$ = 20N

5 0

4 years ago

What does the doppler effect indicate about the motion of galaxies?

Taya2010 [7]

When galaxies move farther away the wavelength of the light is longer causing the galaxy to shift red but if it moves closer, the wavelength of the light gets smaller causing the galaxy to blue shift. The reason that the wavelength increases or decrease is due to the doppler effect.

8 0

3 years ago

Why is the mass of carbon atom greater than the total mass of its protons and electrons

VLD [36.1K]

One or more neutrons in the nucleus add mass to the atom.

8 0

4 years ago

Which of the following describes the magnetic field produced by a current carrying wire? Assume the wire is normal to the page,

Maslowich

D) the magnetic field surrounds the wire like a tube , with a counterclockwise field direction...
as it is in the left hand thumb rule

6 0

3 years ago