How Do Wavelength Differences and Temperature Affect Wave Properties?

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Wavelength differences and temperature significantly influence wave properties, particularly in the context of visible light and sound. For the diffraction grating problem, the separation of maxima can be calculated using the grating equation, which relates wavelength, slit spacing, and angle. The second question involves understanding how temperature affects the speed of sound in air, which in turn influences frequency. It's essential to apply relevant physics equations to solve these problems effectively. Engaging with the material and demonstrating effort is crucial for receiving assistance.
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Hi, I am having a lot of trouble with 2 questions for my physics class.Waves and sound are my weakest points and always struggle to complete a full question the first one is:

1)Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.74m from the grating.
In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 3.22 . What is the difference between these wavelengths?

2)The frequency of the note Fsub4 is fsub F/.
At what air temperature will the frequency be ?

All help would be greatly appreciated. Thanks
 
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