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একটি ধাতব তলে λ তরঙ্গদৈর্ঘ্যের একবর্ণী আলোকরশ্মি আপতিত হলে ফটো-ইলেক্ট্রন নির্গত হয় এবং এক্ষেত্রে বিভবের মান 3Vo একই তলে যখন 2λতরঙ্গদৈর্ঘ্যের একবর্ণী আলো আপতিত হয়, তখন নিবৃত্তি বিভবের মান Vol ফটো-ইলেক্ট্রন নির্গত হওয়ার জন্য ঐ তলটির সূচন তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic light of wavelength λ is incident on a metallic surface then ejects photo-electron and the value of stopping potential is 3Vo. When the same surface is illuminated by a light of wavelength 2λ., the stopping potential becomes Vo. Calculate the threshold wavelength for this surface to eject photo electrons.)
A wavelength converter is termed as _______ if the converted wavelength is longer than the original signal wavelength.
The cut off wavelength and the guided wavelength are given by 0.5 and 2 units respectively. Find the wavelength of the wave.
Which of the following statements is correct about the tsunami? 1. The term Tsunami comes from the Korean word “tsu” meaning harbour and “name” meaning wave. 2. Tsunami has a much smaller amplitude (wavelength) offshore and a very strong wavelength at sea.
The visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an exciting object emits light with a wavelength of 15 nm, to which one of the following ranges does it belong?
Which of the following electromagnetic waves has the longest wavelength?
In the Visible spectrum of light, which of the following colour has the longest wavelength?
Of the following types of electromagnetic radiation, which has the longest wavelength?
which of the following has the longest wavelength
The _________ wavelength is defined as the wavelength greater than which the ratio of the total power and the fundamental mode power has to be decreased to less than 0.1dB.