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3 years ago

Which of the following devices is based on the property of thermal expansion?

2 answers:

6 0

D. thermometer. The warmer it gets, the more energy the particles gain and the more they move and 'expand', rising up the thermometer.

borishaifa [10]3 years ago

5 0

The correct answer to the question is : D) Thermometre

EXPLANATION:

Thermometre is the device used for measuring the temperature of any substance.

Thermal expansion is the process in which the substance will expand when heat is given to that substance. Thermometre is based on the property of thermal expansion.

Generally, the substance that is used in thermometre is mercury. It expands at a fast rate when a little bit of heat is given to the thermometre.

When the thermometre is connected to any body, the heat will flow from body at high temperature to thermometre. The mercury level rises in the thermometre tube which gives the temperature of that substance under consideration.

Hence, it is the thermometre which is based on thermal expansion.

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Orange light of wavelength 0.61 µ m in air enters a block of glass with εr = 1.44. What color would it appear to a sensor embedd

77julia77 [94]

Answer:

$0.5083\ \mu m$

Explanation:

$\lambda_0$ = Actual wavelength = $0.61\ \mu m$

$\varepsilon_r$ = Relative permittivity = 1.44

The observed wavelength in the glass is given by

$\lambda=\dfrac{\lambda_0}{\sqrt{\varepsilon_r}}\\\Rightarrow \lambda=\dfrac{0.61}{\sqrt{1.44}}\\\Rightarrow \lambda=0.5083\ \mu m$

The wavelength lies in the range of green light.

Hence, the observed color of light is $0.5083\ \mu m$

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3 years ago

The interference of two sound waves of slightly different frequencies produces

Leviafan [203]

Beats.

When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called "beating" or producing beats. The beat frequency is equal to the absolute value of the difference in frequency of the two waves.

4 0

3 years ago

Read 2 more answers

Based on the table, what would you predict the speed of sound through ice would most likely be?

MatroZZZ [7]

Answer:

4000m/s

Explanation:

It would be this because sound travels faster through a solid rather than a liquid.

3 0

3 years ago

Achilles and the tortoise are having a race. The tortoise can run 1 mile (or whatever the Hellenic equivalent of this would be)

fenix001 [56]

Answer:

Surely Achilles will catch the Tortoise, in 400 seconds

Explanation:

The problem itself reduces the interval of time many times, almost reaching zero. However, if we assume the interval constant, then it is clear that in two hours Achilles already has surpassed the Tortoise (20 miles while the Tortoise only 3).

To calculate the time, we use kinematic expression for constant speed:

$x_{final}=x_{initial}+t_{tor}v_{tor}=1+t_{tor}\\x_{final}=x_{initial}+t_{ach}v_{ach}=10t_{ach}$

The moment that Achilles catch the tortoise is found by setting the same final position for both (and same time as well, since both start at the same time):

$1+t=10t\\t=1/9 hour=0.11 hours$

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3 years ago

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Lana71 [14]

answer is chemical process

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3 years ago