Find the speed of a mouse that runs 33 feet in 3 seconds.

Photovoltaic cells convert solar energy into electricity. Calculate the wavelength of light (in nm) required for mercury (Φ =7.2

Sholpan [36]

Answer:

275.3 nm is the wavelength of light required for mercury.

Mercury can not be used to generate electricity from the sun because wavelength at which mercury will emit an electron is smaller than 500 nm.

Explanation:

The wavelength of light required for mercury to emit an electron.

The wavelength of the radiation = $\lambda$

Energy required fro mercury to to emit an electron = E

Energy required fro mercury to to emit an electron will the energy if the radiation = E' = $7.22\times 10^{-19} J$

E' = E

To calculate the wavelength of light, we use the equation:

$E=\frac{hc}{\lambda }$

where,

$\lambda$ = wavelength of the light

h = Planck's constant = $6.626\times 10^{-34} Js$

c = speed of light = $3\times 10^8m/s$

$\lambda =\frac{hc}{E}$

$=\frac{6.626\times 10^{-34} Js\times 3\times 10^8m/s}{7.22\times 10^{-19} J}$

$\lambda =2.753\times 10^{-7} m=2.753\times 10^{-7}\times 10^ nm =275.3 nm$

Wavelength of the sun light in the visible region = 500 nm

500 nm > 275.3 nm

$E\propto \frac{1}{\lambda }$

Less energy < more energy

So, this means that mercury can not be used to generate electricity from the sun.

6 0

3 years ago

What is the number of carbon atoms in the ring portion of the haworth structure of glucose?

Anna35 [415]

I have attached the picture ot the Haworth structure of glucose.

You can count in total 6 carbon atoms but only 5 are in the ring portion of the structure.

Therefore, the answer is 5.

8 0

3 years ago

A compound with the empirical formula, ch2, has a molar mass equal to 84.2 g/mol. what is the molecular formula for the compound

MatroZZZ [7]

Mass of CH2 = 12 + 2 = 14 g/mol The number of CH2s there are. So since the total mass is 84.2 g/mol. The solution is 84.2/14 = 6.012 thus the answer is 6 There are 6(CH2) So the molecular formula is C6H12

7 0

3 years ago

A motor cyclist starts from rest and reaches a speed of 6m/s after travelling with uniform acceleration for 3s. What is his acce

choli [55]

Answer:

2m/s²

Explanation:

When an object starts or at its state of rest it has an Initial speed U = 0

Final speed = 6m/s

total time taken for the acceleration = 3s

Acceleration =?

Acceleration is the change in velocity (speed) with time

OR

Time rate of change of velocity

Acceleration = Change in Speed(velocity)

Time taken

Hence,

Acceleration =  V - U 

t

a = 6 - 0

3

a = 6 

3

a = 2m/s²

4 0

3 years ago

A sphere has a mass of 64 g, and a density of 2.0 g/cm3 . what is the radius of the sphere

slega [8]

The size v=masse/density
v= 4*pi*R^3
R=(3*masse/(4*pi*density))^(1/3)
R=1.9695 cm

4 0

3 years ago