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The human eye receives a 3.65x 10"J signal from photons whose wavelength is of S15 nnm. How many photons strike the eye?

 How to draw a Lewis diagram of chlorine gas and methane 

An observer on Earth observes a star performing simple harmonic motion as it moves periodically from point A to point B then back to point A. She determines that it takes 18 days for the star to move from A to B. What is the frequency of the star's oscillation? Give your answer in uHz, correct to two significant figures.

Consider the motion of ball down an inclined plane and determine at which position will it have maximum kinetic energy?

Consider a sound wave of 320 Hz frequency is traveling with a speed of 320 m/sec. Determine the wavelength of the sound wave.

The pH of a solution is 4.80. What is the concentration of hydroxide ions in this solution?

Plz help and if u can explain how u answer it :)

Which of the following compounds show cis-trans isomerism? Draw the cis and trans isomers of those that do.

(b)  

(c)  

(d)

(e)

(f)

7. What is the final velocity of a 0.152 kg t-ball that has a force of 10 N applied for 0.18 seconds starting from rest? 

Example: A piece of unknown metal" with right rectangular prism shape has a width of 3.2 cm, a length of 17.1 cm and height of 4.0 cm Its mass is 1.5 kg. Calculate the density ot the metal in g/cm³.

A 13-N weight and a 12-N weight are connected by a massless stringover a massless, frictionless pulley. The 13-N weight has adownward acceleration with magnitude equal to that of a freelyfalling body times:
A. 1
B. 1/12
C. 1/13
D. 1/25
E. 13/25

I do not understand this question. Can someone please explain whatis going on in this question.

1. What is genetic engineering?