Which of the following best defines the science of separating color wavelengths?a. spectroscopy
b. color-detection
c. photo-chemistry
d. spectrophotometry

Answers

Answer 1

Answer: Answer: spectroscopy

Spectroscopy is the separation of the light in the different wavelengths and spectrophotometry measures the intensities of the different components of the light to get the composition of substances.

Answer 2

Answer:

Answer:

Explanation:

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An electron is pushed into an electric field from infinity where it acquires a 1-V electrical potential. Suppose instead that two electrons are pushed from infinity the same distance into the same electric field. The electrical potential of the two electrons is ___________.a) 0.5V
b) 1V
c) 0.25V
d) 4V
e) 2V

Answers

Answer:

The electrical potential of the two electrons is 1 V.

(b) is correct option.

Explanation:

Given that.

Electric potential = 1 V

We know that,

The electric potential depends on the distance.

The electric potential does not depend on the charge.

The formula of electric potential

$V=Ed$

Where, E = electric field

d = distance

Hence, The electrical potential of the two electrons is 1 V.

An electric dryer consumes 6.0 × 10^6 joules ofelectrical energy when operating at 220 volts for
1.8 × 103 seconds. During operation, the dryer
draws a current of
(1) 10. A (3) 9.0 × 102 A
(2) 15 A (4) 3.3 × 103 A

Answers

Answer : The dryer draws a current of 15 A.

Explanation :

Given that,

Energy consumed, $E=6* 10^6\ J$

Voltage, V = 220 Volts

Time, $t=1.8* 10^3\ s$

Power dissipated is given by :

$P=(E)/(t)$

Also, P = VI

So, $VI=(E)/(t)$

$I=(E)/(Vt)$

$I=(6* 10^6\ J)/(220\ V* 1.8* 10^3\ s)$

$I=15\ A$

So, the correct option is (2)

Hence, this is the required solution.

The dryer draws a current of 15 A.Electric currents is the ratio of charge per unit of time.

What is electric current?

The pace at which electrons travel through a conductor is known as electric current. The ampere is the SI unit for electric current.

Electrons are tiny particles that reside within a substance's molecular structure.

The given data in the problem is;

V is the voltage= 220 volts

E is the electric energy= 6.0 × 10⁶

t is the time =1.8 × 10³ seconds.

I is the electric current=?

The electric current is found as;

$\rm P= (E)/(t) \n\n\ P= VI \n\n VI = (E)/(t) \n\n I= (E)/(VT) \n\n I= (6 * 101^6 )/(220 * 1.8 * 10^3) \n\n \rm I= 15 A$

Hence the dryer draws a current of 15 A.Electric currents is the ratio of charge per unit of time.

To learn more about the electric current refer to the link;

brainly.com/question/7643273

Which of the following is a disadvantage of friction?Air resistance of a parachute slows down the descent of a skydiver.
Friction reduces the efficiency of engines and other machines by converting parts of their kinetic energy into heat.
Friction makes it possible for you to grasp items with your hand.
Friction enables you to walk.

Answers

Explanation:

The disadvantage of friction is that it reduces the efficiency of engines and other machines by converting parts of their kinetic energy into heat.

Friction between moving parts in engines and machines causes resistance, leading to energy loss through heat generation. This energy loss affects the overall efficiency of the system and can lead to increased wear and tear on the components. Engineers often design systems to minimize frictional losses through the use of lubricants, materials with low friction coefficients, or implementing other techniques to reduce friction.

The other statements mention advantages of friction:

- Air resistance of a parachute slows down the descent of a skydiver, which is beneficial for a controlled landing.

- Friction enables you to grasp items with your hand, providing the necessary grip and control.

- Friction also enables you to walk by creating the necessary traction between your feet and the ground, allowing forward motion.

Mary starts from her house, walks 80 meters south, and stops to chat with her aunt on the sidewalk. After chatting for a few minutes, she walks 125 meters to the west to meet a friend and then walks 45 meters north with her friend to a cafe for lunch. Overall, she takes 10 minutes to do all this. What is Mary’s average speed?

Answers

The average speed will be:
Total distance travelled divided by time taken
Total distance (in metres)= 80+125+45=250
Total time (minutes) =10
250/10
=25
Thus Mary's average speed is 25 metres per minute.

Answer:

Total distance (in metres)= 80+125+45=250

Total time (minutes) =10

250/10

=25

Explanation:

Two musicians are comparing their trombones. The first produces a tone that is known to be 438 Hz. When the two trombones play together they produce 6 beats every 2 seconds. Which statement is true about the second trombone? It is producing a 444-Hz sound, and could be producing no other sound frequency. It is producing either a 436-Hz sound or a 440-Hz sound. It is producing either a 435-Hz sound or a 441-Hz sound. It is producing either a 432-Hz sound or a 444-Hz sound. It is producing a 441-Hz sound, and could be producing no other sound frequency.

Answers

Answer:

It is producing either a 435-Hz sound or a 441-Hz sound.

Explanation:

When two sound of slightly different frequencies interfere constructively with each other, the resultant wave has a frequency (called beat frequency) which is equal to the absolute value of the difference between the individual frequencies:

$f_B = |f_1 -f_2|$ (1)

In this problem, we know that:

- The frequency of the first trombone is $f_1 = 438 Hz$

- 6 beats are heard every 2 seconds, so the beat frequency is

$f_B=(6)/(2 s)=3 Hz$

If we insert this data into eq.(1), we have two possible solutions for the frequency of the second trombone:

$f_2 = f_1 - f_B = 438 Hz - 3 Hz = 435 Hz\nf_2 = f_1+f_B = 438 Hz+3 Hz=441 Hz$

A kettle transfers 1500 J of energy, 1200 J to a thermal energy store and 300 J to a vibrational energy store (sound). How efficient is the kettle?

Answers

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Final answer:

To calculate the efficiency of the kettle, divide the useful output energy (1200 J) by the total input energy (1500 J) and multiply by 100%. This results in an efficiency of 80%, meaning 80% of the energy was converted into useful thermal energy.

Explanation:

In order to find the efficiency of the kettle, we need to compute the ratio of the useful output energy to the total input energy and then multiply by 100% to convert the decimal to a percentage. In this case, the useful output energy is the 1200 J transferred to the thermal energy store. The total input energy is the total energy transferred by the kettle which is 1500 J. So, the efficiency of the kettle is (1200 J / 1500 J) * 100% = 80%.

The remaining 20% energy is wasted and was transferred to the vibrational (sound) energy store, which is a non-useful energy output. An efficient appliance is one which converts a higher proportion of the input energy into useful output energy, with less of it wasted. In this case, 80% of the energy from the kettle was converted into useful thermal energy, hence the kettle is quite efficient.