Mohlala oa Lipotso tsa Ts'ebeliso ea Maqhubu a Molumo
Maqhubu a molumo ke ntho e tloaelehileng bophelong ba letsatsi le letsatsi. Ho tloha modumong oa alamo ea hau ea hoseng ho ea puisanong ea molomo, molumo o bapala karolo ea bohlokoa bophelong ba motho. Fisiks, maqhubu a molumo a ithutoa ka botebo ho utloisisa litšobotsi tsa ona, boitšoaro le ts'ebeliso mafapheng a fapaneng. Sengoloa sena se tla tšohla mehlala e 'maloa ea ts'ebeliso ea maqhubu a molumo ho fana ka kutloisiso e betere ea sehlooho sena.
Ho Utloisisa Maqhubu a Molumo
Pele re kena lipotsong tsa mohlala, ha re hlahlobeng hore na maqhubu a molumo ke eng. Maqhubu a molumo ke maqhubu a mechine a tsamaeang ka har'a mecha ea phatlalatso e tenyetsehang joalo ka moea, metsi, kapa thepa e tiileng. Molumo o hlahisoa ke ho thothomela ha ntho e bakang phetoho khatellong sebakeng se potolohileng, 'me phetoho ena e ata joalo ka leqhubu.
Maqhubu a molumo a na le litšobotsi tse kang maqhubu, bolelele ba leqhubu, lebelo le boholo. Maqhubu a leqhubu la molumo a etsa qeto ea hore na molumo o phahame kapa o tlase hakae, o lekanngoa ka hertz (Hz), ha boholo ba molumo bo etsa qeto ea hore na molumo o lerata hakae.
Mohlala oa Lipotso tsa Ts'ebeliso ea Maqhubu a Molumo
Lipotso tse latelang tsa mehlala li etselitsoe ho leka kutloisiso ea hore na melao-motheo ea maqhubu a molumo e sebetsa joang maemong a fapaneng a lefats'e la sebele.
Potso ea 1: Tšusumetso ea Doppler ho Li-Siren tsa Ambulense
Potso: Mohlokomedi o eme ka thoko ho tsela ha ambulense e tsamaya ka lebelo la 30 m/s. Haeba lebelo la modumo moyeng e le 340 m/s, mme maqhubu a nnete a siren e le 1000 Hz, maqhubu a siren a utlwiwang ke mohlokomedi ke afe ha ambulense e atamela mme e mo suthela hole?
Tlhaloso: Potso ena e sebedisa mohopolo wa phello ya Doppler, e leng phetoho maqhubung a maqhubu a modumo a amohelwang ke moshebelli ka lebaka la motsamao o amanang le mohlodi wa modumo ho ya ho moshebelli.
Karabo:
1. Ha ambulense e atamela motho ya shebellang:
\[
f' = f \left(\frac{v + v_0}{v – v_s}\right)
\]
moo \(f'\) e leng maqhubu a utlwiwang, \(f\) ke maqhubu a mohlodi, \(v\) ke lebelo la modumo, \(v_0\) ke lebelo la mohlokomedi (tabeng ena 0 hobane mohlokomedi ha a eme), mme \(v_s\) ke lebelo la mohlodi (ambulense).
\[
f' = 1000 \left(\frac{340}{340 – 30}\right) \hoo e ka bang 1093 Hz
\]
2. Ha ambulense e ntse e tsamaya:
\[
f' = f \left(\frac{v – v_0}{v + v_s}\right)
\]
\[
f' = 1000 \left(\frac{340}{340 + 30}\right) \hoo e ka bang 915 Hz
\]
Potso ea 2: Ho utloahala ha molumo ka har'a phaephe e bulehileng
Potso: Phaephe ea setho e bulehileng lipheletsong ka bobeli e bolelele ba 85 cm. Ke maqhubu afe a motheo a phaephe ena haeba lebelo la molumo moeeng e le 340 m/s?
Tlhaloso: Phaepheng e bulehileng, molumo o hlaha ha bolelele ba phaephe bo le halofo ea bolelele ba leqhubu. Bakeng sa molumo oa motheo, bolelele ba phaephe bo lekana le halofo ea bolelele ba leqhubu (\(\lambda/2\)).
Karabo:
1. Bolelele ba modumo wa motheo (maqhubu a motheo) ke:
\[
\lambda = 2L = 2 \makgetlo a 0.85 \mongolo{m} = 1.7 \mongolo{m}
\]
2. Maqhubu (\(f\)) a balwa ho sebediswa foromo:
\[
f = \frac{v}{\lambda} = \frac{340}{1.7} \hoo e ka bang 200 \mongolo{Hz}
\]
Potso ea 3: Matla a Molumo le Maemo a Matla
Potso: Mochini o hlahisa molumo o nang le matla a 0.5 W. Haeba mochini o behiloe ka phapusing e koetsoeng ea cubic e nang le lehlakore la 10 m, boemo ba matla a molumo bohareng ba phapusi ke bofe? Nka hore matla 'ohle a molumo a ntšoa ka ho lekana mahlakoreng 'ohle.
Tlhaloso: Matla a molumo (\(I\)) ke matla ka sebaka sa yuniti. Boemo ba matla a molumo (\(L\)) bo lekanngoa ka li-decibel (dB).
Karabo:
1. Bala matla a molumo:
\[
I = \frac{P}{A} = \frac{0.5}{4\pi r^2}
\]
Bohareng ba kamore, \(r\) ke halofo ea lehlakore la kyubite (5 m):
\[
I = \frac{0.5}{4\pi (5)^2} = \frac{0.5}{314} \hoo e ka bang 0.00159 \mongolo{ W/m}^2
\]
2. Bala boemo ba matla a modumo (\(L\)) ka dB:
\[
L = 10 \log_{10} \left(\frac{I}{I_0}\right)
\]
Moo \(I_0 = 1 \times 10^{-12} \text{ W/m}^2\) e leng matla a referense:
\[
L = 10 \log_{10} \left(\frac{0.00159}{1 \times 10^{-12}}\right) \hoo e ka bang 92.02 \text{dB}
\]
Qetello
Maqhubu a molumo a bapala karolo ea bohlokoa masimong a mangata, 'me ho utloisisa ts'ebeliso ea ona ho bohlokoa saenseng le theknolojing. Ka ho ithuta mehlala e kang e kaholimo, re ka utloisisa hamolemo hore na khopolo-taba ea maqhubu a molumo e sebetsa joang maemong a sebele a lefats'e, joalo ka phello ea Doppler, molumo oa liletsa tsa 'mino, le ho lekanya matla a molumo.
Jwalo ka moithuti kapa setsebi lefapheng lena, kutlwisiso e ntle ya mehopolo ya motheo le tshebediso ya yona e tla nolofatsa tharollo ya mathata le boqapi ba theknoloji bo amanang le modumo le medumo.
