Subject Answers

What is the de Broglie wavelength? Why do we care?

The de Broglie wavelength is the wavelength associated with what we call matter waves - i.e. waves associated with particles that are in motion. Now, do keep in...

"An infared wave has a wavelength of 1.5 x10^–6 m. The speed of this wave is 2.2 × 10^8 m/s. Calculate the frequency of the wave. Give your answer in standard form and to 2 significant figures."

The infrared wave is the part of the electromagnetic spectrum that comes right before visible light (when ordered from low to high frequencies). It is a transve...

"A car of mass 1500kg is travelling at 10 ms-1 along a horizontal road. A brake force of 3000N brings it to rest. Calculate the deceleration of the car and the distance travelled by the car whilst decelerating."

This is a classic forces question, which is seen in different variations throughout the past papers. To calculate the answer we will need to re-arrange the forc...

"An ideal gas within a closed system undergoes an isothermal expansion from an initial volume of 1m^3 to 2m^3. Given that the initial pressure of the gas is 10^5 Pa, find the final pressure of the gas following the expansion."

This is an ideal gas question, so the equation PV=NKT will be used. Here P tells us Pressure, V=volume, N=number of particles, K= Boltzmann's constant and T=Tem...

What is the difference between an elastic and inelastic collision

Remember, that in all collisions momentum is conserved; that is, the momentum before the collision will always be equal to the momentum after the collision in a...

"A student studied how a few parameters of the electromagnetic radiation affects the I-V(current-voltage) curve of photoelectricity. By increasing one parameter he saw that the saturation current has risen. Which parameter it was?"

A: The saturation current is essentially a measure of the maximum possible current that can flow - in this case, measured as the rate of flow of photoelectrons....

The S.I. unit of momentum is?

The SI unit of momentum is kg m s-1. It can be understood from the equation of momentum itself:Since p = mvTherefore, in terms of units: p (units) = kg ms-1Anot...

"Two trains are heading in opposite directions on the same track. Train X- mass = 16000kg & speed = 2.8m/s. Train Y- mass = 12000kg & speed = 3.1m/s. At what speed do the joined trains move off together immediately after the collision?"

In this scenario, the two trains approach each other, and then after collision “stick” together. This is an example of inelastic collisions, wherein kinetic ene...

"What is the change in temperature of 2kg of water heated by a kettle using a voltage of 230V at 0.5A of current for 10 seconds? Assume no heat losses."

By assuming no heat losses, we are essentially saying that all of the electrical energy supplied to the kettle is equal to the heat energy that has been transmi...

"A light wave has a wavelength of 420nm, calculate the energy of this wave in joules."

We know that the energy of a wave particle can be found using the formula:E = hfWhere f = frequency (Hz), E = Energy (J), h = Planck's constantWe also know that...

Subject Answers

Physics

What is the de Broglie wavelength? Why do we care?

"An infared wave has a wavelength of 1.5 x10^–6 m. The speed of this wave is 2.2 × 10^8 m/s. Calculate the frequency of the wave. Give your answer in standard form and to 2 significant figures."

"A car of mass 1500kg is travelling at 10 ms-1 along a horizontal road. A brake force of 3000N brings it to rest. Calculate the deceleration of the car and the distance travelled by the car whilst decelerating."

"An ideal gas within a closed system undergoes an isothermal expansion from an initial volume of 1m^3 to 2m^3. Given that the initial pressure of the gas is 10^5 Pa, find the final pressure of the gas following the expansion."

What is the difference between an elastic and inelastic collision

"A student studied how a few parameters of the electromagnetic radiation affects the I-V(current-voltage) curve of photoelectricity. By increasing one parameter he saw that the saturation current has risen. Which parameter it was?"

The S.I. unit of momentum is?

"Two trains are heading in opposite directions on the same track. Train X- mass = 16000kg & speed = 2.8m/s. Train Y- mass = 12000kg & speed = 3.1m/s. At what speed do the joined trains move off together immediately after the collision?"

"What is the change in temperature of 2kg of water heated by a kettle using a voltage of 230V at 0.5A of current for 10 seconds? Assume no heat losses."

"A light wave has a wavelength of 420nm, calculate the energy of this wave in joules."

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Subject Answers

Physics

What is the de Broglie wavelength? Why do we care?

"An infared wave has a wavelength of 1.5 x10^–6 m. The speed of this wave is 2.2 × 10^8 m/s. Calculate the frequency of the wave. Give your answer in standard form and to 2 significant figures."

"A car of mass 1500kg is travelling at 10 ms-1 along a horizontal road. A brake force of 3000N brings it to rest. Calculate the deceleration of the car and the distance travelled by the car whilst decelerating."

"An ideal gas within a closed system undergoes an isothermal expansion from an initial volume of 1m^3 to 2m^3. Given that the initial pressure of the gas is 10^5 Pa, find the final pressure of the gas following the expansion."

What is the difference between an elastic and inelastic collision

"A student studied how a few parameters of the electromagnetic radiation affects the I-V(current-voltage) curve of photoelectricity. By increasing one parameter he saw that the saturation current has risen. Which parameter it was?"

The S.I. unit of momentum is?

"Two trains are heading in opposite directions on the same track. Train X- mass = 16000kg & speed = 2.8m/s. Train Y- mass = 12000kg & speed = 3.1m/s. At what speed do the joined trains move off together immediately after the collision?"

"What is the change in temperature of 2kg of water heated by a kettle using a voltage of 230V at 0.5A of current for 10 seconds? Assume no heat losses."

"A light wave has a wavelength of 420nm, calculate the energy of this wave in joules."

Need help with Test?

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