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Light from a monochromatic light source a laser passed through a diffraction grating

produced an interference pattern on a screen. The distance between the grating and

screen was 1.2m and the grating had 150 lines per mm. If the gap between both third

images on the screen was 56cm, calculate the wavelength of the laser light. thanks really stuck

A person standing 99m from the foot of a cliff claps his hands and hears an echo 0.6s later. Calculate the velocity of sound in air. thanks

What is the current in a circuit when 600C flow through it for 2 minutes? thanks

What is the current in a circuit when 600C flow through it for 2 minutes? thanks

An ac waveform has a period of 5ms. What is its frequency

thanks

How do sound waves travel in air thanks

A transformer steps down a voltage from 230V to 6V. The number of turns in the secondary coil is 42, calculate the number of turns in the primary coil?

thanks

What is the current in a circuit when 600C flow through it for 2 minutes

thanks

(a) An object is placed 20cm from a converging lens of focal length 15cm. Find the position

of the image

A 1.5kW kettle raised the temperature of 2 litres of water from to .

How long did it take? (The specific heat capacity of water is 4189J/kgK)

thanks

2 A resistor of 1ohm is placed in series with a pair of parallel resistors of resistance 2ohms and 4ohms respectively and a power supply unit. A current of 1A flows through the 4 resistor.

Calculate:

(i) the total resistance of the circuit

thanks

(ii) the current that passes through the 2 ohm resistor

(iii) the current that passes through the 1ohm resistor

(iv) the total potential difference

I dont know what he means by that(2 A resistor of 1ohm is placed in series )

thanks

Light from a monochromatic light source a laser passed through a diffraction grating

produced an interference pattern on a screen. The distance between the grating and

screen was 1.2m and the grating had 150 lines per mm. If the gap between both third

images on the screen was 56cm, calculate the wavelength of the laser light.

thanks

Can anyone tell me How to reverse text in word so that when you print the letters on to fabric the text will be shown the correct way. or any tutorial website that may help,

Thanks.

find the distance between the following points (2,0)and (5,0) i dont know the formula can u please explain how to solve this problem thanks

Please can someone help me with this?

What would be the correct way to break down how you get your answer to this question and is there a formula you can use?

Total cooking time = (no of kg. of flour) * (minutes per kg.) + 10 minutes. If 0.8kg of flour was used, and it takes 60 minutes to cook/bake 1 kg of flour, how long will it take to cook/bake the bread?

Thanks.

Please can someone help me with this?

What would be the correct way to break down how you get your answer to this question and is there a formula you can use?

Total cooking time = (no of kg. of flour) * (minutes per kg.) + 10 minutes. If 0.8kg of flour was used, and it takes 60 minutes to cook/bake 1 kg of flour, how long will it take to cook/bake the bread?

Thanks.

citric acid is triprotic carboxylic acid i need the chemical formula and other thing is i have another formula for citric acid which says here citric acid is a carboxylic acid and formula is C6H8O7 i cant understand what is the differ between citric acid is triprotic carboxylic acid and citric acid is a carboxylic acid and formula is C6H8O7 thanks a million

When answering the question below what is the correct formula for calculating compound interest?

Question: A woman borrows €3,500 at 6% per annum, compound interest, and agrees to pay €1,000 off the loan at the end of each year. How much is still owed after 3 years?

Thanks

What would be the best way to lay out the answer for the following question and is there a formula you can use?

Total cooking time = (no of kg. of flour) * (minutes per kg.) + 10 minutes. If 0.8kg. of flour was used, and it takes 60 minutes to cook/bake 1 kg. of flour, how long will it take to cook/bake the bread?

Thanks

State the differences between eukaryotic cells and prokaryotic cells giving one example of each and why one is considered more evolved than the other?

Thanks.