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3 years ago

Refraction occurs when a wave changes its A) color. B) frequency. C) intensity. D) speed.

Physics

2 answers:

mojhsa [17]3 years ago

4 0

Explanation :

Light shows many different types of phenomena like the reflection of light, refraction of light etc.

Refraction of light is the phenomena of bending of light when it passes from one medium to another. This is due to the difference in the refractive indices of two media.

Refractive index is given by :

$n=\dfrac{c}{v}$

c is the speed of light in vacuum

v is the speed of the light in a medium.

So, refraction occurs when a wave changes its speed.

Hence, the correct option is (D) "speed".

Gwar [14]3 years ago

3 0

The answer would be d. speed.

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Answer:

The value is $t = 689.029 \ hours$

Explanation:

From the question we are told that

The molar mass of hydrazine is $Z = 32 g/mol = \frac{32}{1000} = 0.032 \ kg/mol$

The initial temperature is $T_i = -186 ^o F = (-186-32) *\frac{5}{9} +273.15 = 152\ K$

The final temperature is $T_f = 78 ^o F = (78-32) *\frac{5}{9} +273.15 = 298.7 \ K$

The specific heat capacity is $c_h = 0.099 [kJ/(mol K)] = 0.099 *10^3 J/(mol/K)$

The power available is $P = 300 \ W$

The mass of the fuel is $m = 1640 \ kg$

Generally the number of moles of hydrazine present is

$n = \frac{m}{Z}$

=> $n = \frac{1640}{= 0.032}$

=> $n = 51250 \ mol$

Generally the quantity of heat energy needed is mathematically represented as

$Q = n * c_h * (T_f -T_i)$

=> $Q = 51250 * 0.099 *10^3 * (298.7 - 152)$

=> $Q = 7.441516913 * 10^{8} \ J$

Generally the time taken is mathematically represented as

$t = \frac{Q}{P}$

=> $t = \frac{7.441516913 * 10^{8} }{300}$

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Converting to hours

$t = \frac{2480505.6377}{3600}$

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2 years ago

an audio CD has a diameter of 120 mm and spins at up to 540 rpm. When a CD is spinning at its maximum rate, how much time is req

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Answer:

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Explanation:

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w = 540 rpm (2pi rad / 1 rev) (1 min / 60s)

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When at maximum speed we can use angular kinematic relationships to find the time for a sperm revolution with zero angular acceleration

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t = 0.1111 s

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2 years ago

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MakcuM [25]

Answer:

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Explanation:

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2 years ago

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zimovet [89]

Answer:

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3 years ago

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Answer:

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Part 2)

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