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3 years ago

The pictures shows what a student observed when he looked through a hand lens at a penny.

Physics

2 answers:

igomit [66]3 years ago

7 0

The answer is A. Refracted

sergeinik [125]3 years ago

6 0

A. The light is refracted

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List some reasons why growth characteristics are more useful on agar plates than on agar slants

SpyIntel [72]

Usually, in culturing of the bacteria we have a slant and then portion f it is transferred to the agar plate. The growth characteristics are more useful in the agar plates because it is where we really do the observation because bacteria in slants are still to be transferred in the agar plates.

5 0

3 years ago

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What is the RMS speed of Helium atoms when the temperature of the Helium gas is 206.0 K? (Possibly useful constants: the atomic

saw5 [17]

Answer:

a)1.13×10³

b)1.6×10³

Explanation:

Given:

Boltzmann's constant (K)=1.38×10^-23 J/K

atmoic mass of helium = 4 AMU or 4×1.66×10^-27kg

a)The formula for RMS speed (Vrms) is given as

$Vrms=\sqrt{\frac{3KT}{m} }$

where

K= Boltzmann's constant

T= temperature

m=mass of the gas

$Vrms=\sqrt{\frac{3\times 1.38\times 10^{-23}\times 206}{6.64\times 10^{-27}}}$

$Vrms=1.13\times 10^{3}m/s$

b) RMS speed of helium when the temperature is doubled

$Vrms=\sqrt{\frac{3\times 1.38\times 10^{-23}\times 2\times 206}{6.64\times 10^{-27}}}$

$Vrms=1.598\times 10^{3}m/s$

4 0

4 years ago

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A golf ball has more mass than a tennis ball because it ____. (1 point) takes up more space. contains more matter. contains diff

Elis [28]

D.) Because it has a definite composition...

5 0

3 years ago

A scuba diver, submerged under water looks up and seessunlight

maw [93]

Answer:

$41.7975\ ^{\circ}$

Explanation:

$n_2$ = Refraction index of water = 1.333

$n_1$ = Refraction index of air = 1

$\theta_2$ = Angle of sunlight = 30°

From Snell's law we have

$\dfrac{n_1}{n_2}=\dfrac{sin\theta_2}{sin\theta_1}\\\Rightarrow \theta_1=sin^{-1}\dfrac{n_2sin\theta_2}{n_1}\\\Rightarrow \theta_1=sin^{-1}\dfrac{1.333sin30}{1}\\\Rightarrow \theta_1=41.7975\ ^{\circ}$

The angle measured from the vertical does the sunlight strike thesurface of the water is $41.7975\ ^{\circ}$

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3 years ago

Which of the following is a substance that is found between the cell membrane and the nucleus, which primarily consists of water

Alex

This would be Cytoplasm , hope this helps

Hugs

5 0

4 years ago