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4 years ago

To indicate the light dependent process _______ must be excited

Physics

1 answer:

vlada-n [284]4 years ago

7 0

Electrons must be excited

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What will be the fundamental frequency and first three overtones for a 26cm long organ at 20°C if it is open ( at 20°C, the spee

kakasveta [241]

Explanation:

The frequency of an organ pipe if it is open is given by :

$f=\dfrac{nv}{2l}$

v is speed of sound in air is 343 m/s at 20°C

For fundamental frequency, n = 1

$f=\dfrac{1\times 343}{2\times 0.26}\\\\f=659.61\ Hz$

First overtone frequency,

$f_1=2f\\\\f_1=2\times 659.61\\\\f_1=1319.22\ Hz$

Second overtone frequency,

$f_2=3f\\\\f_2=3\times 659.61\\\\f_2=1978.83\ Hz$

Third overtone frequency

$f_3=4f\\\\f_3=4\times 659.61\\\\f_3=2638.44\ Hz$

Hence, this is the required solution.

3 0

3 years ago

A flat plate maintained at a temperature of 80°C experiences a flow of atmospheric air at 0°C. If the temperature gradient at th

dimulka [17.4K]

Answer:

h =12.9 w/m2 k

Explanation:

we know that thermal conductivity of air K at 0 degree celcius = 0.024 w/mk

T_S = 80 Degree celcius

temperature gradient = -43 degree C/mm = - 43*1000 / m $\frac{dT}{dx} = - 43*1000 / m$

by fourier law

$Q = -k_{air} A * \frac{dT}{dx}$

$\frac{Q}{A} = -0.024 *1*(-43000)$

q = 1032 watt/m2

we know that from newton's law

q = h (T_s - T_∞)

1032 = h*(80 - 0)

h =12.9 w/m2 k

4 0

3 years ago

Huck Finn walks at a speed of 0.70 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the sho

ZanzabumX [31]

Answer

given,

Hunk Finn speed,v_y= 0.7 m/s

Speed of river,v_x = 1.50 m/s

Assuming the speed of the river is in x-direction.

Speed of Hunk Finn to be in y-direction.

Hunk velocity relative to river =

$x = \sqrt{v_y^2+v_x^2}$

$x = \sqrt{2.74}$

$x =1.66\ m/s$

Speed of Hunk relative to river = 1.66 m/s

direction of the boat

$\theta =tan^{-1}(\dfrac{v_y}{v_x})$

$\theta =tan^{-1}(\dfrac{0.7}{1.50})$

$\theta = 25.01^{\circ}$

Hence, angle of the raft is 24.01°

6 0

4 years ago

How much time does it take an object to fall 4.9 meter?

Andreas93 [3]

Answer:

C more than 1 second

Explanation:

it will take time since its 4.9 meters and how hard you throw it down

3 0

3 years ago

What is moment and it's type

olga2289 [7]

Explanation:

The turning effect of a force is called moment .

There are two types of moment. They are:-

clockwise moment
anti-clockwise moment

8 0

3 years ago