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What is the de Broglie wavelength associated with an electron, accelerated through a potential differnece of 100

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Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How fast does a hydrogen atom have to travel in order to have the same momentum as that of the

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Ultraviolet light of wavelength 2271 Å from a 100 W mercury source irradiates a photo-cell made of molybdenum metal. If the stopping potential is –1.3 V, estimate the work function of the metal. How would the photo-cell respond to a high intensity (∼105 W m–2) red light of wavelength 6328 Å produced by a He-Ne laser

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Define one

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Define these for a body in SHM

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A wire in the form of a tightly wound solenoid is connected to a DC source, and carries a current. If the coil is stretched so that there are gaps between successive elements of the spiral coil, will the current increase or decrease?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A conducting rod PQ of length `4l` is rotated about a point O in a uniform magnetic field `vecB . PO=l`

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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For a circular coil of radius R and N turns carrying current I, the magnitude of the magnetic field at a point on its axis at a distance x from its centre is given by, B=`(mu_0IR^2N ) /(2(x^2+R^2)^(3/2))`(i) Show that this reduces to the familiar result for field at the centre of the coil.(ii) Consider two parallel co-axial circular coils of equal radius R, and number of turns N, carrying equal currents in the same direction, and separated by a distance R. Show that the field on the axis around the mid-point between the coils is uniform over a distance

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A length L of wire carries a steady current 1. It is bent first to form a coil of 1 turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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There are 50 turns / cm in a long solenoid. If 4 Amp current is flowing in the solenoid, the approximate value of mag. field along its axis at an internal point and one end will be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Electric charges `q, q ,-2q` are placed at the corners of an equilateral `Delta ABC` of side `l`. The magnitude of electric dipole moment of the system

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A current of 10A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due north on the table

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Two particles of masses `m_a & m_b` and same charge are projected in a perpendicular magnetic field. They travel along circular paths of radius `r_a and r_b` such that `r_a > r_b`. Then, which is

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A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the

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A ray PQ is incident normally on the face AB of a triangular prism of refracting angle of 60° made of a transparent material of refractive index `2/sqrt3` as shown in the figure. Trace the path of the ray as it passes through the prism. Also, calculate the angle of emergence and angle of deviation.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) With the help of a suitable ray diagram, derive the mirror formula for a concave mirror. (ii) The near point of a hypermetropic person is 50 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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(i) Draw a neat labelled ray diagram of an astronomical telescope in normal adjustment. Explain briefly its working. (ii) An astronomical telescope uses two lenses of powers 10D and ID. What is its magnifying power in normal

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a single slit diffraction experiment, a monochromatic source of light of wavelength `lambda` illuminates a narrow slit of width `a.` Show giving appropriate reasoning, that the half angular width of the central maximum in the observed pattern is (nearly) equal to

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Mention one physical process for the release of electron from the surface of a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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