PHYSICS HIGH SCHOOL

A photon with a wavelength of 2.29 × 10^–7 meter strikes a mercury atom in the ground state.Calculate the energy, in joules, of this photon. [Show all work, including the equation and
substitution with units.]

Answers

Answer 1
Answer:

Answer:

Energy of photon, E=8.64* 10^(-19)\ J

Explanation:

It is given that,

Wavelength of photon, \lambda=2.29* 10^(-7)\ m

It strikes a mercury atom in the ground state. We have to find the energy of this photon. It can be calculated using below relation as :

E=(hc)/(\lambda)

Where

h is the Planck's  constant

c is the speed of light

So, E=(6.6* 10^(-34)\ J-s* 3* 10^8\ m/s)/(2.29* 10^(-7)\ m)

E=8.64* 10^(-19)\ J

Hence, the above value is the energy of this photon.
Answer 2
Answer: detailed solution is attached

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Sodium hydroxide (NaOH) was added to pure water (H2O). Which most likely were the pH values of the water before and after the sodium hydroxide was added to it?A. before = 7, after = 9
B. before = 7, after = 4
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Answers

Before 7 after 9. A pH smaller than 7 indicates acidity with 0 being completely acidic. A pH greater than 7 shows alkalinity with 14 being completely alkaline. 7 is neutral. Since NaOH is alkaline, adding it to a neutral substance would increase the pH and it would increase from 7 to 9.

Answer:

A before = 7, after = 9

Explanation:

The first thing to focus on when creating a workout plan isdetermining the frequency of the activity
choosing the intensity level
watching others complete the activity
selecting an activity you enjoy

Answers

I think the best answer is option one. The first thing to focus on when creating a workout plan is determining the frequency of the activity. It is important took look at how much time do you have to do things in order to manage your tasks daily and you can give enough time for each activity.
Key points you need remember while doing workout are:

1. Frequency
2. Intensity
3. Time
4. Type.

As you may expect, this refers to however typically you may exercise. Once any sort of exercise is performed your body completes a method of reconstruction and repairing. So, decisive the frequency of exercise is vital so as to search out a balance that has simply enough stress for the body to adapt and conjointly permits enough rest time for healing.
Therefore, the first thing to focus on when creating a workout plan is determining the frequency of the activity. It is important to take a look at how much time do you have to do things in order to manage your tasks daily and you can give enough time for each activity.

Meaning of geosynchronous satellite

Answers

Meaning of geosynchronous satellite:

A satellite above Earth placed in a geosynchronous circular orbit, inclined at an angle with the equatorial plane of Earth and orbiting at an orbital period equal to that of earth’s rotational period is termed as a geosynchronous satellite. Geosynchronous orbit is a High Earth orbit at a distance of 42,164 kilometres from the centre of earth such that the gravitational pull from earth is fair enough for the object in orbital motion to match with the speed of earth’s rotational period (24 hrs)

As an observer from ground, a geosynchronous satellite appears to be at a stationary point, at any part of the day; since it's velocity synchronizes with the angular velocity that of earth. A geosynchronous satellite orbiting in an equatorial plane without any inclinations is termed as a geostationary satellite.  

What is BEST to say about a runner who is running at a constant velocity? A. Their acceleration is positive. B. Their acceleration is negative. C. Their acceleration is zero. D. Their acceleration cannot be determined.

Answers

The question is asking us what is BEST to say about a runner who is running at a constant velocity? A constant velocity (=speed) means that they are not getting faster or slower - they are running exactly as fast all the time. This meanst that their speed does not change, so their change of speed is equal to 0. A change of speed is called acceleration so their C. Their acceleration is zero. - C is the correct answer.

the correct answer is C.

A hair curling iron uses 13 watts of power. how long must it operate to do 1,040 joules of work?

Answers


Knowing the solution to the 4-watt night light, you ought to be able to do this one on your own.  But 5 points is 5 points, so here we go:

1 watt = 1 joule/second .

                            (1,040 joule) / (13 joule/second)

                        =    (1,040 / 13) (second)

                        =       80 seconds .  
Power of Watt = Energy in Joules / Time period in seconds

13 watts = 1040 joules / time in seconds
time in seconds = 1040 joules / 13 watts
time in seconds = 80 seconds

It must operate for 80 seconds to do 1,040 joules of work.

A mountain climber ascends a mountain to its peak. The peak is 12,470 ft above sea level. The climber then descends 80 ft to meet a fellow climber. Find the climber's elevation above sea level after meeting the other climber. A. -12,390 ft. B. 12,550 ft. C. 11,670 ft. D. 12,930 ft

Answers

The answer is 12,390 ft.

At first, a climber is at 12,470 ft above sea level. But then, he goes down 80 ft to meet a fellow climber. So, this simply needs to be distracted:
12,470 ft - 80 ft = 12,390 ft
This is the elevation above sea level at which he meet the other climber.
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