Amass spectrometer accelerates doubly ionized atoms of charge 2e over a potential difference v before they enter a uniform magnetic field b which is perpendicular to the direction of motion of the ions. if d is the radius of the ions' path in the magnetic field, what is the mass m of one ion? express your answer only in terms of v, b, e and d. the potential v is low enough that no relativistic corrections are needed

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

Can anybody me with this? ? (picture included.)

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?